{"title":"Marine Sailing Blocks and Pulleys","description":"\u003cp\u003eExplore Marine Sailing Blocks and Pulleys at Mariners Warehouse. Compare available products and review each listing for part numbers and specifications.\u003c\/p\u003e","products":[{"product_id":"ronstan-wire-block-tubular-rivet-head-w-removable-nylatron-sheave-45mm-1-3-4-sheave-diameter-55033","title":"Ronstan Wire Block - Tubular Rivet Head with Removable Nylatron® Sheave - 45mm (1-3\/4\") Sheave Diameter MPN - RF103","description":"\u003cb\u003eWire Block - Tubular Rivet Head w\/Removable Nylatron® Sheave - 45mm(1-3\/4\") Sheave Diameter\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eWire blocks have purpose designed narrow sheaves and grooves.Removal sheave for easy fitting and without cutting the wire termination\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eFlared cheeks to minimise chafing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRemovable sheaves\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003eWire blocks suit halyards, vang and backstay applications\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eGrade 316 stainless steel cheeks\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eNylatron® sheave\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e 45mm(1-3\/4\")\u003cbr\u003e\u003cb\u003eMax. Cable Ø:\u003c\/b\u003e 6mm(1\/4\")\u003cbr\u003e\u003cb\u003eM.W.L:\u003c\/b\u003e850kg(1,870lbs)\u003cbr\u003e\u003cb\u003eB.L.:\u003c\/b\u003e 1,700kg(3,740lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e 88kg(3.1oz)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385917362338,"sku":"55033","price":58.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55033XL.jpg?v=1765315546"},{"product_id":"ronstan-wire-block-ferrule-top-w-removable-nylontron-sheave-45mm-1-34-sheave-diameter-55034","title":"Ronstan RF104 45mm Single Block","description":"\u003cb\u003eWire Block - Ferrule Top w\/Removable Nylatron® Sheave - 45mm(1-3\/4\") Sheave Diamter\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eWire blocks have purpose designed narrow sheaves and grooves.Removal sheave for easy fitting and without cutting the wire termination\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eFlared cheeks to minimise chafing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRemovable sheaves\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003eWire blocks suit halyards, vang and backstay applications\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eGrade 316 stainless steel cheeks\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eNylatron® sheave\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e 45mm(1-3\/4\")\u003cbr\u003e\u003cb\u003eMax. Cable Ø:\u003c\/b\u003e 6mm(1\/4\")\u003cbr\u003e\u003cb\u003eM.W.L:\u003c\/b\u003e850kg(1,870lbs)\u003cbr\u003e\u003cb\u003eB.L.:\u003c\/b\u003e 1,700kg(3,740lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e 80kg(2.8oz)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385917493410,"sku":"55034","price":55.07,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55034XL.jpg?v=1765315549"},{"product_id":"ronstan-wire-block-tubular-rivet-head-w-nylatron-sheave-25mm-1-sheave-diameter-55035","title":"Ronstan Wire Block - Tubular Rivet Head with Nylatron® Sheave - 25mm (1\") Sheave Diameter MPN - RF418","description":"\u003cb\u003eWire Block - Tubular Rivet Head w\/Nylatron® Sheave - 25mm Sheave Diameter\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eWire blocks have purpose designed narrow sheaves and grooves.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003eWire blocks suit halyards, vang and backstay applications\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eGrade 316 stainless steel cheeks\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eNylatron® sheave\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e 25mm(1\")\u003cbr\u003e\u003cb\u003eMax. Cable Ø:\u003c\/b\u003e 3mm(1\/8\")\u003cbr\u003e\u003cb\u003eM.W.L:\u003c\/b\u003e450kg(990lbs)\u003cbr\u003e\u003cb\u003eB.L.:\u003c\/b\u003e 900kg(1,980lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e 40kg(1.4oz)","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385917460642,"sku":"55035","price":31.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55035XL.jpg?v=1765315549"},{"product_id":"ronstan-wire-block-w-removable-clevis-pin-head-nylatron-sheave-25mm-1-sheave-diameter-55036","title":"Ronstan Wire Block with Removable Clevis Pin Head - Nylatron® Sheave - 25mm (1\") Sheave Diameter MPN - RF418C","description":"\u003cb\u003eWire Block w\/Removable Clevis Pin Head - Nylatron® Sheave - 25mm(1\") Sheave Diameter\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eWire blocks have purpose designed narrow sheaves and grooves.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003eRemovable clevis pin head\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003eWire blocks suit halyards, vang and backstay applications\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eGrade 316 stainless steel cheeks\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eNylatron® sheave\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e 25mm(1\")\u003cbr\u003e\u003cb\u003eMax. Cable Ø:\u003c\/b\u003e 3mm(1\/8\")\u003cbr\u003e\u003cb\u003eM.W.L:\u003c\/b\u003e450kg(990lbs)\u003cbr\u003e\u003cb\u003eB.L.:\u003c\/b\u003e 900kg(1,980lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e 40kg(1.4oz)","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385917591714,"sku":"55036","price":34.29,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55036XL.jpg?v=1765315551"},{"product_id":"ronstan-kite-block-black-w-white-sheave-pair-55071","title":"Ronstan Kite Block - Black with White Sheave (Pair) MPN - RF13101-2","description":"\u003cb\u003eKite Block - Black w\/White Sheave\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eLightweight durable construction\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eEconomical\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaintenance free\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eVang, cunningham and trapeze retriever systems on dinghies\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLeech line tackles, bunk adjusters etc on larger yachts\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eU.V. stabilized Acetal sheaves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eNylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e16mm(5\/8\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e4mm(5\/32\")","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385919492258,"sku":"55071","price":18.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55071XL.jpg?v=1765315584"},{"product_id":"ronstan-series-45-core-block-single-swivel-shackle-head-55217","title":"Ronstan Series 45 Core Block™ - Single - Swivel Shackle Head MPN - RF44100","description":"\u003cb\u003eSeries 45 Core Block™ - Single - Swivel Shackle Head\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eCore Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eUniversal Bearing\u003c\/b\u003e\u003cbr\u003eDynamic and high static load performance\u003cbr\u003e\u003cbr\u003eThe Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 1\u003c\/b\u003e - Under moderate loads, Acetal ball bearings ensure minimum friction.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 2\u003c\/b\u003e - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.\u003cbr\u003e\u003cbr\u003eAdditionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAlloy Cheek Plates\u003c\/b\u003e\u003cbr\u003eBlock cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings.  Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eHigh dynamic and static load capacity\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eEfficient 2-stage bearing system\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBall bearings to counteract side thrust loads\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eClass leading performance and sleek, contemporary styling\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDurable aluminium alloy cheek plates\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCentral hub hole can be used as a becket take-off or tie-up point\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 10M (33')\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVarious control line applications on larger yachts\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAlloy sheave models are available for use with wire\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eSheave: U.V. stabilized Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCheek body: Aluminium Alloy\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShackle, head post \u0026amp; hub: Grade 316 stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t45mm(1-3\/4\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t12mm(1\/2\")\u003cbr\u003e\u003cb\u003ePin Ø:\u003c\/b\u003e\t5mm(3\/16\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t700kg(1,540lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t1,400kg(3,090lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t104g(3.6oz)","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385929388194,"sku":"55217","price":84.28,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55217XL.jpg?v=1765315708"},{"product_id":"ronstan-nylatron-sheave-box-single-upright-lead-block-55219","title":"Ronstan Nylatron Sheave Box - Single Upright Lead Block MPN - RF453","description":"\u003cb\u003eNylatron Sheave Box - Single Upright Lead Block\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eLead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers.When mounted in an inverted position, are frequently used as upright leads.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003eThe external tabs can be formed to fit the spar profile before fastening\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003eTypically used in dinghy spars for control lines such as outhauls\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eNylatron® sheave\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel load housing\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t22mm(7\/8\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t3mm(1\/8\")\u003cbr\u003e\u003cb\u003eMax. Cable Ø:\u003c\/b\u003e\t3mm(1\/8\")\u003cbr\u003e\u003cb\u003eFastener Ø:\u003c\/b\u003e\t5mm(3\/16\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t160kg(350lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t350kg(700lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t30g(1.1oz)","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385929584802,"sku":"55219","price":37.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55219XL.jpg?v=1765315711"},{"product_id":"ronstan-series-55-ball-bearing-orbit-block-single-becket-swivel-head-55256","title":"Ronstan Series 55 Ball Bearing Orbit Block™ - Single - Becket - Swivel Head MPN - RF55110","description":"\u003cb\u003eSeries 55 Ball Bearing Orbit Block™ - Single - Becket - Swivel Head\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eLightweight\u003c\/b\u003e\u003cbr\u003eKilogram for kilogram of working load, BB and RT Orbit Blocks™ are the world's lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimises the mass of the inactive return race and hub.\u003cbr\u003e\u003cbr\u003eWeight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible.\u003cbr\u003e\u003cbr\u003eMulti-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement. This gives a 30% weight saving advantage over the nearest competitor. Other brands just link together their single blocks. This results in unnecessary double cheeks between each sheave, held together by a heavy steel channel across the top of the block.\u003cbr\u003e \u003cbr\u003e\u003cb\u003eHighest Working Load In Its Class\u003c\/b\u003e\u003cbr\u003eThe orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximises load performance. The  proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range. \u003cbr\u003e\u003cbr\u003eThe floating sheave and bearing system is supported by a fiber-reinforced load frame. The design was computer modelled to be stress optimised. The Dyneema® Link is produced from FSE Robline SK75 fiber, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eUltra Lightweight\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLow friction 2-stage Orbital ball bearing system\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHighest working load in its class\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLow profile and compact\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh performance cleating\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSwivel shackle head for unlimited block rotation\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStainless steel shackle head for ultimate durability and compatibility with harsh fixing points\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUltra low profile integrated becket\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eMainsheet systems on dinghies, sportsboats and small keelboats to 9M(30')\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSpinnaker sheets on dinghies, sportsboats and small keel boats to 9M(30')\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHalyard, Vang and Backstay application on boats to 8M(26')\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eControl line applications on larger yachts\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eIdeal use for mainsheet systems and spinnaker sheets on dinghies, sportsboats and small keel boats to 9M(30')\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAlso ideal with halyard, vang and backstay applications on boats to 8M(26')\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSpinnaker sheets on sportsboats and small keel boats (lateral lead blocks)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eControl line applications on larger yachts\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eBall bearings - High compression strength carbon black Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStage 2 bearing - Carbon fiber reinforced, PTFE impregnated Nylon\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFrame\/Cheeks - Toughened, glass fiber reinforced Nylon\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRope Link: UV stabilized, multi-strand impregmented SK75 Dyneema®\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSheave: Carbon fiber reinforced, PTFE impregnated Nylon\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHead fitting: Grade 316 stainless steel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t55mm(2-5\/32\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e    10mm(3\/8\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t500kg(1,100lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t1,000kg(2,200lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t88g(3.1oz)","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385932009634,"sku":"55256","price":59.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55256XL.jpg?v=1765315751"},{"product_id":"ronstan-series-55-ratchet-orbit-block-single-swivel-head-auto-manual-55257","title":"Ronstan Series 55 Ratchet Orbit Block™ - Single - Swivel Head - Auto \u0026 Manual MPN - RF56100","description":"\u003cb\u003eSeries 55 Ratchet Orbit Block™ - Single - Swivel Head - Auto \u0026amp; Manual\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAutomatic Ratchet Block\u003c\/b\u003e\u003cbr\u003eNow you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.\u003cbr\u003e\u003cbr\u003e \u003cbr\u003e\u003cb\u003eAwesome Ratchet Block Holding Power\u003c\/b\u003e\u003cbr\u003eQuite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitior. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designes have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimise rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load. \u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eUp to 20:1 holding power\u003c\/li\u003e\n\u003cli\u003eSmooth easing of sheets\u003c\/li\u003e\n\u003cli\u003eHigh performance cleating\u003c\/li\u003e\n\u003cli\u003eSwivel shackle head for unlimited block rotation.\u003c\/li\u003e\n\u003cli\u003eStainless steel shackle head for ultimate durability and compatibility with harsh fixing points.\u003c\/li\u003e\n\u003cli\u003eAutomatic \u0026amp; manual ratchet block\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eMainsheet systems and spinnaker sheets on dinghies, sportsboats and small keel boats to 8M(26')\u003c\/li\u003e\n\u003cli\u003eHalyard, vang and backstay applications on boats to 8M(26')\u003c\/li\u003e\n\u003cli\u003eSpinnaker sheets on sportsboats and small keel boats (lateral lead blocks)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eSheave: Hard anodised Aluminium\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Aceetal\u003c\/li\u003e\n\u003cli\u003eFrame\/Cheeks: Toughened, glass fiber reinforced Nylon\u003c\/li\u003e\n\u003cli\u003eRope Link: UV stabilized, multi-strand impregnated SK75 Dyneema®\u003c\/li\u003e\n\u003cli\u003eHead fitting: grade 316 stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t55mm(2\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e    10mm(1\/2\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t250kg(550lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t650kg(1,430lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t82g(2.9oz)","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385932173474,"sku":"55257","price":110.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55257XL.jpg?v=1765315753"},{"product_id":"ronstan-series-25-utility-block-single-loop-head-55258","title":"Ronstan Series 25 Utility Block - Single - Loop Head MPN - RF571","description":"\u003cb\u003eSeries 25 Utility Block™ - Single - Loop Head\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eStainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase. \u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eLightweight durable construction\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eEconomical\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaintenance free\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eVang, cunningham and trapeze retriever systems on dinghies\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLeech line tackles, bunk adjusters, etc on larger boats\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eU.V. stabilized acetal sheaves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 Stainless Steel cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t25mm(1\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e    6mm(1\/4\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t300kg(660lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t600kg(1,320lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t15g(0.5oz)","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385932206242,"sku":"55258","price":16.03,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55258XL.jpg?v=1765315754"},{"product_id":"ronstan-series-25-utility-block-single-swivel-shackle-head-55259","title":"Ronstan Series 25 Utility Block - Single - Swivel Shackle Head MPN - RF573","description":"\u003cb\u003eSeries 25 Utility Block™ - Single - Swivel Shackle Head\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003eStainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase. \u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eLightweight durable construction\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eEconomical\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaintenance free\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eVang, cunningham and trapeze retriever systems on dinghies\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLeech line tackles, bunk adjusters, etc on larger boats\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eU.V. stabilized acetal sheaves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 Stainless Steel cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t25mm(1\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e    6mm(1\/4\")\u003cbr\u003e\u003cb\u003ePin Ø:\u003c\/b\u003e 4mm(5\/32\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t150kg(330lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t300kg(660lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t20g(0.7oz)","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385932370082,"sku":"55259","price":25.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55259XL.jpg?v=1765315756"},{"product_id":"ronstan-series-60-core-block-single-55260","title":"Ronstan Series 60 Core Block™ - Single MPN - RF64100","description":"\u003cb\u003eSeries 60 Core Block™ - Single\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eCore Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eUniversal Bearing\u003c\/b\u003e\u003cbr\u003eDynamic and high static load performance\u003cbr\u003e\u003cbr\u003eThe Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 1\u003c\/b\u003e - Under moderate loads, Acetal ball bearings ensure minimum friction.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 2\u003c\/b\u003e - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.\u003cbr\u003e\u003cbr\u003eAdditionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAlloy Cheek Plates\u003c\/b\u003e\u003cbr\u003eBlock cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings.  Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eUniversal head\u003c\/b\u003e\u003cbr\u003eThe head assembly incorporates a brass bearing washer to provide smooth 360™ rotation of the post and shackle. A set screw arrangement allows the head to be locked at 0™ or 90™.\u003cbr\u003e\u003cbr\u003eShackles are high quality forged grade 316 stainless steel.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eClass leading performance and sleek, contemporary styling\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExcellent dynamic and high static load performance\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLess than half the friction of the nearest competitor\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUniversal head with full 3-axis articulation\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHead posts can be locked at 0 or 90 degrees, by using a 2.5mm Hex\/Allen Key\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCentral hub hole can be used as a becket take-off or tie-up point\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 12M (40')\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVarious control line applications on larger yachts\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eSheave: U.V. stabilized Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCheek body: Aluminium Alloy\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShackle, head post \u0026amp; hub: Grade 316 stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t60mm(2-3\/8\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t12mm(1\/2\")\u003cbr\u003e\u003cb\u003ePin Ø:\u003c\/b\u003e\t6mm(1\/4\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t1,000kg(2,200lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t2,000kg(4,410lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t235g(8.3oz)","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385932402850,"sku":"55260","price":132.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55260XL.jpg?v=1765315756"},{"product_id":"ronstan-series-60-core-block-single-becket-55261","title":"Ronstan Series 60 Core Block™ - Single - Becket MPN - RF64110","description":"\u003cb\u003eSeries 60 Core Block™ - Single - Becket\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eCore Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eUniversal Bearing\u003c\/b\u003e\u003cbr\u003eDynamic and high static load performance\u003cbr\u003e\u003cbr\u003eThe Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 1\u003c\/b\u003e - Under moderate loads, Acetal ball bearings ensure minimum friction.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 2\u003c\/b\u003e - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.\u003cbr\u003e\u003cbr\u003eAdditionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAlloy Cheek Plates\u003c\/b\u003e\u003cbr\u003eBlock cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings.  Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eUniversal head\u003c\/b\u003e\u003cbr\u003eThe head assembly incorporates a brass bearing washer to provide smooth 360™ rotation of the post and shackle. A set screw arrangement allows the head to be locked at 0™ or 90™.\u003cbr\u003e\u003cbr\u003eShackles are high quality forged grade 316 stainless steel.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eClass leading performance and sleek, contemporary styling\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExcellent dynamic and high static load performance\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLess than half the friction of the nearest competitor\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUniversal head with full 3-axis articulation\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHead posts can be locked at 0 or 90 degrees, by using a 2.5mm Hex\/Allen Key\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCentral hub hole can be used as a becket take-off or tie-up point\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 12M (40')\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVarious control line applications on larger yachts\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eSheave: U.V. stabilized Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCheek body: Aluminium Alloy\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShackle, head post \u0026amp; hub: Grade 316 stainless steel\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePin: 2205 Stainless Steel\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t60mm(2-3\/8\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t12mm(1\/2\")\u003cbr\u003e\u003cb\u003ePin Ø:\u003c\/b\u003e\t6mm(1\/4\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t1,000kg(2,200lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t2,000kg(4,410lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t275g(9.7oz)","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385932501154,"sku":"55261","price":181.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55261XL.jpg?v=1765315759"},{"product_id":"ronstan-series-19-utility-block-single-ferrule-eye-head-55263","title":"Ronstan Series 19 Utility Block™ - Single - Ferrule Eye Head MPN - RF663","description":"\u003cb\u003eSeries 19 Utility Block™ - Single - Ferrule Eye Head\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eStainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase. \u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eLightweight durable construction\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eEconomical\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaintenance free\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eVang, cunningham and trapeze retriever systems on dinghies\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLeech line tackles, bunk adjusters, etc on larger boats\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eU.V. stabilized acetal sheaves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 Stainless Steel cheeks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t19mm(3\/4\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e    5mm(3\/16\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t150kg(330lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t450kg(990lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t10g(0.4oz)\u003cbr\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385932533922,"sku":"55263","price":25.22,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55263XL.jpg?v=1765315759"},{"product_id":"ronstan-series-75-core-block-single-55264","title":"Ronstan Series 75 Core Block™ - Single MPN - RF74100","description":"\u003cb\u003eSeries 75 Core Block™ - Single\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eCore Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eUniversal Bearing\u003c\/b\u003e\u003cbr\u003eDynamic and high static load performance\u003cbr\u003e\u003cbr\u003eThe Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 1\u003c\/b\u003e - Under moderate loads, Acetal ball bearings ensure minimum friction.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 2\u003c\/b\u003e - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.\u003cbr\u003e\u003cbr\u003eAdditionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAlloy Cheek Plates\u003c\/b\u003e\u003cbr\u003eBlock cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings.  Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eUniversal head\u003c\/b\u003e\u003cbr\u003eThe head assembly incorporates a brass bearing washer to provide smooth 360™ rotation of the post and shackle. A set screw arrangement allows the head to be locked at 0™ or 90™.\u003cbr\u003e\u003cbr\u003eShackles are high quality forged grade 316 stainless steel.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eClass leading performance and sleek, contemporary styling\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExcellent dynamic and high static load performance\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLess than half the friction of the nearest competitor\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUniversal head with full 3-axis articulation\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHead posts can be locked at 0 or 90 degrees, by using a 2.5mm Hex\/Allen Key\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCentral hub hole can be used as a becket take-off or tie-up point\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 14M (46')\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVarious control line applications on larger yachts\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eSheave: U.V. stabilized Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCheek body: Aluminium Alloy\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShackle, head post \u0026amp; hub: Grade 316 stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t75mm(3\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t14mm(9\/16\")\u003cbr\u003e\u003cb\u003ePin Ø:\u003c\/b\u003e\t8mm(5\/16\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t1,500kg(3,300lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t3,000kg(6,600lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t354g(12.5oz)\u003cbr\u003e\u003cbr\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385932632226,"sku":"55264","price":181.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55264XL.jpg?v=1765315762"},{"product_id":"ronstan-series-75-core-block-single-aluminum-rope-wire-sheave-55265","title":"Ronstan Series 75 Core Block™ - Single - Aluminum Rope\/Wire Sheave MPN - RF74100AW","description":"\u003cb\u003eSeries 75 Core Block™ - Single - Aluminum Rope\/Wire Sheave\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eCore Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eUniversal Bearing\u003c\/b\u003e\u003cbr\u003eDynamic and high static load performance\u003cbr\u003e\u003cbr\u003eThe Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 1\u003c\/b\u003e - Under moderate loads, Acetal ball bearings ensure minimum friction.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eStage 2\u003c\/b\u003e - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.\u003cbr\u003e\u003cbr\u003eAdditionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAlloy Cheek Plates\u003c\/b\u003e\u003cbr\u003eBlock cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings.  Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eUniversal head\u003c\/b\u003e\u003cbr\u003eThe head assembly incorporates a brass bearing washer to provide smooth 360™ rotation of the post and shackle. A set screw arrangement allows the head to be locked at 0™ or 90™.\u003cbr\u003e\u003cbr\u003eShackles are high quality forged grade 316 stainless steel.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eClass leading performance and sleek, contemporary styling\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExcellent dynamic and high static load performance\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLess than half the friction of the nearest competitor\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUniversal head with full 3-axis articulation\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHead posts can be locked at 0 or 90 degrees, by using a 2.5mm Hex\/Allen Key\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCentral hub hole can be used as a becket take-off or tie-up point\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDurable alloy Rope\/Wire sheave\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 14M (46')\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVarious control line applications on larger yachts\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAluminium sheave which has a deep groove profile specifically made for use with wire\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eSheave: U.V. stabilized Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCheek body: Aluminium Alloy\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Acetal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShackle, head post \u0026amp; hub: Grade 316 stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t75mm(3\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t14mm(9\/16\")\u003cbr\u003e\u003cb\u003eMax. Cable Ø:\u003c\/b\u003e  8mm(5\/16\")\u003cbr\u003e\u003cb\u003ePin Ø:\u003c\/b\u003e\t8mm(5\/16\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t1,500kg(3,300lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t3,000kg(6,600lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t432g(15.3oz)\u003cbr\u003e\u003cbr\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385932664994,"sku":"55265","price":298.81,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55265XL.jpg?v=1765315762"},{"product_id":"ronstan-single-lead-block-19mm-3-4-sheave-diameter-55380","title":"Ronstan Single Lead Block - 19mm (3\/4\") Sheave Diameter MPN - RF917","description":"\u003cb\u003eSingle Lead Block - 19mm(3\/4\") Sheave Diameter\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eLead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003eTypically used in dinghy spars for control lines\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eU.V. stabilized Acetal sheave\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel load housing\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t19mm(3\/4\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t8mm(5\/16\")\u003cbr\u003e\u003cb\u003eFastener Ø:\u003c\/b\u003e\t5.0mm(3\/16\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t250kg(550lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t550kg(1,100lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t20g(0.7oz)\u003cbr\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385939513506,"sku":"55380","price":20.86,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55380XL.jpg?v=1765315858"},{"product_id":"ronstan-single-lead-block-29mm-1-3-32-sheave-diameter-55381","title":"Ronstan Single Lead Block - 29mm (1-3\/32\") Sheave Diameter MPN - RF919","description":"\u003cb\u003eSingle Lead Block - 29mm(1-3\/32\") Sheave Diameter\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eLead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplications:\u003c\/b\u003e\u003cbr\u003eTypically used in dinghy spars for control lines\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMaterials:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eU.V. stabilized Acetal sheave\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel load housing\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSheave Ø:\u003c\/b\u003e\t29mm(1-3\/32\")\u003cbr\u003e\u003cb\u003eMax. Rope Ø:\u003c\/b\u003e\t6mm(1\/4\")\u003cbr\u003e\u003cb\u003eFastener Ø:\u003c\/b\u003e\t5.0mm(3\/16\")\u003cbr\u003e\u003cb\u003eM.W.L.:\u003c\/b\u003e\t600kg(1,320lbs)\u003cbr\u003e\u003cb\u003eB. L.:\u003c\/b\u003e\t1,200kg(2,640lbs)\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\t50g(1.8oz)\u003cbr\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46385939742882,"sku":"55381","price":24.07,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/55381XL.jpg?v=1765315860"},{"product_id":"ronstan-series-45-stand-up-core-block-swiveling-66602","title":"Ronstan Series 45 Stand-Up Core Block - Swiveling MPN - RF44140","description":"\u003cstrong\u003eSeries 45 Stand-Up Core Block - Swiveling\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eCore Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eUniversal Bearing\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eDynamic and high static load performance\u003c\/li\u003e\n\u003cli\u003eThe Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003c\/li\u003e\n\u003cli\u003eStage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction\u003c\/li\u003e\n\u003cli\u003eStage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance\u003c\/li\u003e\n\u003cli\u003eAdditionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn’t perfect. Particularly important for cheek blocks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eAlloy Cheek Plates\u003c\/strong\u003e\u003cbr\u003eBlock cheeks are manufactured from the highest quality alloy for maximum strength. Material optimization and the cut-away design minimizes weight and allows easy fresh water rinsing of salt and debris from the bearings. \u0026amp;nbsp;Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimizing rope wear.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eHigh dynamic and static load capacity\u003c\/li\u003e\n\u003cli\u003eEfficient 2-stage bearing system\u003c\/li\u003e\n\u003cli\u003eBall bearings to counteract side thrust loads\u003c\/li\u003e\n\u003cli\u003eClass leading performance and sleek, contemporary styling\u003c\/li\u003e\n\u003cli\u003eDurable aluminium alloy cheek plates\u003c\/li\u003e\n\u003cli\u003eCentral hub hole can be used as a becket take-off or tie-up point\u003c\/li\u003e\n\u003cli\u003eFeatures a strong cast padeye base with a swivel head post to allow full rotation and articulation\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 10M (33')\u003c\/li\u003e\n\u003cli\u003eVarious control line applications on larger yachts\u003c\/li\u003e\n\u003cli\u003eAlloy sheave models are available for use with wire\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eSheave: U.V. stabilised Acetal\u003c\/li\u003e\n\u003cli\u003eCheek body: Aluminium Alloy\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Acetal\u003c\/li\u003e\n\u003cli\u003eShackle, head post \u0026amp; hub: Grade 316 stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386271223970,"sku":"66602","price":156.32,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/66602XL.jpg?v=1765320819"},{"product_id":"ronstan-series-45-core-block-single-swivel-haylard-66604","title":"Ronstan Series 45 Core Block - Single\/Swivel Halyard MPN - RF44188","description":"\u003cstrong\u003eSeries 45 Core Block - Single\/Swivel Haylard\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eCore Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eUniversal Bearing\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eDynamic and high static load performance\u003c\/li\u003e\n\u003cli\u003eThe Ronstan Universal Bearing incorporates our proven 2-stage bearing system\u003c\/li\u003e\n\u003cli\u003eStage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction\u003c\/li\u003e\n\u003cli\u003eStage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance\u003c\/li\u003e\n\u003cli\u003eAdditionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn’t perfect. Particularly important for cheek blocks\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eAlloy Cheek Plates\u003c\/strong\u003e\u003cbr\u003eBlock cheeks are manufactured from the highest quality alloy for maximum strength. Material optimization and the cut-away design minimizes weight and allows easy fresh water rinsing of salt and debris from the bearings. \u0026amp;nbsp;Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimizing rope wear.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eHigh dynamic and static load capacity\u003c\/li\u003e\n\u003cli\u003eEfficient 2-stage bearing system\u003c\/li\u003e\n\u003cli\u003eBall bearings to counteract side thrust loads\u003c\/li\u003e\n\u003cli\u003eClass leading performance and sleek, contemporary styling\u003c\/li\u003e\n\u003cli\u003eDurable aluminium alloy cheek plates\u003c\/li\u003e\n\u003cli\u003eCentral hub hole can be used as a becket take-off or tie-up point\u003c\/li\u003e\n\u003cli\u003eIncorporates a low profile swivel head fork\u003c\/li\u003e\n\u003cli\u003eFeatures a removable screw pin for attachment to padeyes\u003c\/li\u003e\n\u003cli\u003eSuitable for 12mm (1\/2\") diam. mast collar post\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eIdeal for mainsheet, halyard and spinnaker sheet applications on boats to 10M (33')\u003c\/li\u003e\n\u003cli\u003eVarious control line applications on larger yachts\u003c\/li\u003e\n\u003cli\u003eAlloy sheave models are available for use with wire\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eSheave: U.V. stabilised Acetal\u003c\/li\u003e\n\u003cli\u003eCheek body: Aluminium Alloy\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Acetal\u003c\/li\u003e\n\u003cli\u003eShackle, head post \u0026amp; hub: Grade 316 stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386271387810,"sku":"66604","price":139.18,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/66604XL.jpg?v=1765320822"},{"product_id":"ronstan-series-60-ultimate-ratchet-single-66612","title":"Ronstan Series 60 Ultimate Ratchet - Single MPN - RF62100","description":"\u003cstrong\u003eSeries 60 Ultimate Ratchet - Single\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eThe extruded hole design, in conjunction with the groove profile of the sheave, provides a more powerful grip than conventional designs - up to 20:1 holding power. Unrivaled low weight is achieved by the use of a Torlon® ratchet pawl, high grade machined alloy sheave and black Acetal hubs and bearings. On-Off switching knob is fitted to both sides of the swivel blocks (one can be removed if desired). Ratchet blocks can be disassembled for servicing or customization.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eUnrivalled 20:1 holding power\u003c\/li\u003e\n\u003cli\u003eDual sided On-Off switch\u003c\/li\u003e\n\u003cli\u003eAbility to operate On\/Off switch under load\u003c\/li\u003e\n\u003cli\u003eLow friction ball bearing system\u003c\/li\u003e\n\u003cli\u003eLightweight\u003c\/li\u003e\n\u003cli\u003eCheek cut-outs for easy bearing maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eMainsheet on powerful dinghies and skiffs\u003c\/li\u003e\n\u003cli\u003eSeries 60 mainsheet systems on sports boats using RF7 mainsheet swivel units\u003c\/li\u003e\n\u003cli\u003eControl line applications on larger yachts\u003c\/li\u003e\n\u003cli\u003eSpinnaker sheets on sports boats and small keel boats (lateral lead blocks)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eCarbon black Acetal ball bearings\u003c\/li\u003e\n\u003cli\u003eAnodised aluminium sheave and cheek plates\u003c\/li\u003e\n\u003cli\u003eTorlon® ratchet pawl\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel forged shackle\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eSheave Ø: 2-3\/8\"\u003c\/li\u003e\n\u003cli\u003eMax. Rope Ø: 3\/8\"\u003c\/li\u003e\n\u003cli\u003ePin Ø: 3\/16\"\u003c\/li\u003e\n\u003cli\u003eM.W.L.: 550lb\u003c\/li\u003e\n\u003cli\u003eB. L.: 3020lb\u003c\/li\u003e\n\u003cli\u003eWeight: 5.3oz\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386271781026,"sku":"66612","price":245.26,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/66612XL.jpg?v=1765320829"},{"product_id":"ronstan-series-60-all-purpose-single-block-swivel-shackle-head-non-locking-66613","title":"Ronstan Series 60 All Purpose Single Block Swivel Shackle Head - Non-Locking MPN - RF66100","description":"\u003cstrong\u003eSeries 60 All Purpose Single Block Swivel Shackle Head - Non-Locking\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eAll purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eExceptionally high working loads\u003c\/li\u003e\n\u003cli\u003eLow maintenance, long service life\u003c\/li\u003e\n\u003cli\u003eSelf-lubricating Acetal polymer sheave ensures low friction and extreme durability\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eMainsheet and halyard applications, vang and spinnaker control lines on boats to 10M (33')\u003c\/li\u003e\n\u003cli\u003eS60 - on boats up to 12M (40')\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eSheave Ø: 2-3\/8\"\u003c\/li\u003e\n\u003cli\u003eMax. Rope Ø: 9\/16\"\u003c\/li\u003e\n\u003cli\u003ePin Ø: 1\/4\"\u003c\/li\u003e\n\u003cli\u003eM.W.L.: 2430lb\u003c\/li\u003e\n\u003cli\u003eB. L.: 4850lb\u003c\/li\u003e\n\u003cli\u003eWeight: 8.7oz\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386271879330,"sku":"66613","price":64.21,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/66613XL.jpg?v=1765320832"},{"product_id":"ronstan-series-75-ultimate-ratchet-single-66614","title":"Ronstan Series 75 Ultimate Ratchet - Single MPN - RF72100","description":"\u003cstrong\u003eSeries 75 Ultimate Ratchet - Single\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eThe extruded hole design, in conjunction with the groove profile of the sheave, provides a more powerful grip than conventional designs - up to 20:1 holding power. Unrivaled low weight is achieved by the use of a Torlon® ratchet pawl, high grade machined alloy sheave and black Acetal hubs and bearings. On-Off switching knob is fitted to both sides of the swivel blocks (one can be removed if desired). Ratchet blocks can be disassembled for servicing or customization.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eUnrivaled 20:1 holding power\u003c\/li\u003e\n\u003cli\u003eDual sided On-Off switch\u003c\/li\u003e\n\u003cli\u003eAbility to operate On\/Off switch under load\u003c\/li\u003e\n\u003cli\u003eLow friction ball bearing system\u003c\/li\u003e\n\u003cli\u003eLightweight\u003c\/li\u003e\n\u003cli\u003eCheek cut-outs for easy bearing maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eMainsheet on powerful dinghies and skiffs\u003c\/li\u003e\n\u003cli\u003eSeries 60 mainsheet systems on sports boats using RF7 mainsheet swivel units\u003c\/li\u003e\n\u003cli\u003eControl line applications on larger yachts\u003c\/li\u003e\n\u003cli\u003eSpinnaker sheets on sports boats and small keel boats (lateral lead blocks)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eCarbon black Acetal ball bearings\u003c\/li\u003e\n\u003cli\u003eAnodised aluminium sheave and cheek plates\u003c\/li\u003e\n\u003cli\u003eTorlon® ratchet pawl\u003c\/li\u003e\n\u003cli\u003eGrade 316 stainless steel forged shackle\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eSheave Ø: 3\"\u003c\/li\u003e\n\u003cli\u003eMax. Rope Ø: 1\/2\"\u003c\/li\u003e\n\u003cli\u003ePin Ø: 9\/32\"\u003c\/li\u003e\n\u003cli\u003eM.W.L.: 930lb\u003c\/li\u003e\n\u003cli\u003eB. L.: 4400lb\u003c\/li\u003e\n\u003cli\u003eWeight: 5.7oz\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386271912098,"sku":"66614","price":297.45,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/66614XL.jpg?v=1765320832"},{"product_id":"ronstan-series-50-all-purpose-single-loop-top-becket-70679","title":"Ronstan Series 50 All Purpose Single Loop Top - Becket MPN - RF51111","description":"\u003cp\u003e\u003cstrong\u003eSeries 50 All Purpose Single Loop Top - Becket\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExceptionally high working loads\u003c\/li\u003e\n\u003cli\u003eLow maintenance, long service life\u003c\/li\u003e\n\u003cli\u003eSelf-lubricating Acetal polymer sheave ensures low friction and extreme durability\u003c\/li\u003e\n\u003cli\u003eSnap fit removable becket pin\u003c\/li\u003e\n\u003cli\u003eSpare Parts - RF51010 Replacement Becket Pin\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAll purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Becket pin is removable so line can be spliced prior to fitting and is ingeniously locked into position without the use of a clevis pin, split ring or tools.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)\u003c\/li\u003e\n\u003cli\u003eS60 - on boats up to 12m (40ft)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGrade 316 stainless steel load strap\u003c\/li\u003e\n\u003cli\u003eImpact and UV resistant, fiber reinforced Nylon cheeks\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386370347170,"sku":"70679","price":60.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/70679XL.jpg?v=1765322606"},{"product_id":"ronstan-series-55-ratchet-mount-orbit-block-single-becket-swivel-70701","title":"Ronstan Series 55 Ratchet Mount Orbit Block - Single Becket Swivel MPN - RF56110","description":"\u003cp\u003e\u003cstrong\u003eSeries 55 Ratchet Mount Orbit Block - Single Becket Swivel\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eUp to 20:1 holding power\u003c\/li\u003e\n\u003cli\u003eSmooth easing of sheets\u003c\/li\u003e\n\u003cli\u003eHigh performance cleating\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eAutomatic ratchet block\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNow you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.\u003c\/p\u003e\u003cp\u003e* Selected Series 55 models.\u003c\/p\u003e\u003cp\u003e \u003cstrong\u003eAwesome ratchet block holding power\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eQuite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitor. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designs have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimize rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load. \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSheave: Anodized Aluminium\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Acetal\u003c\/li\u003e\n\u003cli\u003eFrame\/Cheeks: Toughened, glass fiber reinforced Nylon\u003c\/li\u003e\n\u003cli\u003eRope Link: UV stabilized, multi-strand impregnated SK75 Dyneema®\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386371264674,"sku":"70701","price":107.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/70701XL.jpg?v=1765322625"},{"product_id":"ronstan-series-55-ratchet-mount-orbit-block-single-cleat-swivel-auto-70702","title":"Ronstan Series 55 Ratchet Mount Orbit Block - Single Cleat Swivel - Auto MPN - RF56120","description":"\u003cp\u003e\u003cstrong\u003eSeries 55 Ratchet Mount Orbit Block - Single Cleat Swivel - Auto\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eUp to 20:1 holding power\u003c\/li\u003e\n\u003cli\u003eSmooth easing of sheets\u003c\/li\u003e\n\u003cli\u003eHigh performance cleating\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eAutomatic Ratchet Block\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNow you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.\u003c\/p\u003e\u003cp\u003e* Selected Series 55 models.\u003c\/p\u003e\u003cp\u003e \u003cstrong\u003eAwesome ratchet block holding power\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eQuite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitor. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designs have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimize rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load. \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSheave: Anodized Aluminium\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Acetal\u003c\/li\u003e\n\u003cli\u003eFrame\/Cheeks: Toughened, glass fiber reinforced Nylon\u003c\/li\u003e\n\u003cli\u003eRope Link: UV stabilized, multi-strand impregnated SK75 Dyneema®\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386371297442,"sku":"70702","price":202.42,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/70702XL.jpg?v=1765322625"},{"product_id":"ronstan-series-55-ratchet-mount-orbit-block-single-becket-cleat-swivel-70704","title":"Ronstan Series 55 Ratchet Mount Orbit Block - Single Becket Cleat Swivel MPN - RF56130","description":"\u003cp\u003e\u003cstrong\u003eSeries 55 Ratchet Mount Orbit Block - Single Becket Cleat Swivel\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eUp to 20:1 holding power\u003c\/li\u003e\n\u003cli\u003eSmooth easing of sheets\u003c\/li\u003e\n\u003cli\u003eHigh performance cleating\u003c\/li\u003e\n\u003cli\u003eAutomatic ratchet block\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eAutomatic ratchet block\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNow you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.\u003c\/p\u003e\u003cp\u003e* Selected Series 55 models.\u003c\/p\u003e\u003cp\u003e \u003cstrong\u003eAwesome ratchet block holding power\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eQuite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. 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These faces are offset from the radial line, to draw the rope down into the gripping area when under load. \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSheave: Anodised Aluminium\u003c\/li\u003e\n\u003cli\u003eBall Bearings: High compression strength carbon black Aceetal\u003c\/li\u003e\n\u003cli\u003eFrame\/Cheeks: Toughened, glass fibre reinforced Nylon\u003c\/li\u003e\n\u003cli\u003eRope Link: UV stabilized, multi-strand impregnated SK75 Dyneema®\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":46386371428514,"sku":"70704","price":208.49,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3170\/5250\/files\/70704XL.jpg?v=1765322627"},{"product_id":"ronstan-series-55-ratchet-mount-orbit-block-cheek-clockwise-rotation-70705","title":"Ronstan Series 55 Ratchet Mount Orbit Block - Cheek - Clockwise Rotation MPN - RF56151","description":"\u003cp\u003e\u003cstrong\u003eSeries 55 Ratchet Mount Orbit Block - Cheek - Clockwise Rotation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eUp to 20:1 holding power\u003c\/li\u003e\n\u003cli\u003eSmooth easing of sheets\u003c\/li\u003e\n\u003cli\u003eHigh performance cleating\u003c\/li\u003e\n\u003cli\u003eAutomatic \u0026amp; manual ratchet block\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eAutomatic ratchet block\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNow you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. 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Its holding power is up to 21:1, almost double that of our nearest competitor. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designs have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimize rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load. \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSimple and secure attachment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe Dyneema® Link is easily fitted and is retained securely by a molded retainer clip. The flexible link can be left with one end attached to the block when fitting - no more lost shackle pins. The system is compatible with Dyneema®\/Spectra® strops, webbing and caron connection points - much more so than steel loop tops or shackles. In auto mode, the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. 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Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.\u003c\/p\u003e\u003cp\u003e* Selected Series 55 models.\u003c\/p\u003e\u003cp\u003e \u003cstrong\u003eAwesome ratchet block holding power\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eQuite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitor. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designs have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimize rope wear. 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It is perfect for small synthetic control lines found on high-tech dinghies. 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Sheaves run on duplex stainless steel hubs and incorporate precision composite journal bearings and thrust washers. 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