{"product_id":"lewmar-60mm-synchro-block-double-w-becket-black-5-16-3-8-line-239-29926005","title":"Lewmar 60mm Synchro Block – Double with Becket, Black, 5\/16”–3\/8” Line","description":"\u003ch2\u003ePrecision-Engineered for Speed and Low Friction\u003c\/h2\u003e\u003cp\u003eThe Lewmar 60mm Synchro Double Block with Becket is built for sailors who demand smooth, efficient line handling under load. Its high-density, free-spin plain bearing and self-aligning swivel head minimize friction and keep lines running cleanly through every point of sail. The patented shackle post lock makes attachment and removal fast and secure — no tools required.\u003c\/p\u003e\u003cp\u003eConstructed with stainless steel straps and glass-fibre reinforced cheeks, the Synchro series is engineered to handle the rigors of performance sailing while keeping weight low. The sheave, bearing, pin, and line size are matched for optimum mechanical efficiency across the 5\/16”–3\/8” line range.\u003c\/p\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMainsheet and traveler systems\u003c\/li\u003e\n\u003cli\u003eVang and cunningham purchase systems\u003c\/li\u003e\n\u003cli\u003eGenoa and jib sheet blocks\u003c\/li\u003e\n\u003cli\u003eRunning rigging on performance sailboats\u003c\/li\u003e\n\u003cli\u003eLine sizes: 5\/16” to 3\/8” (8–10mm)\u003c\/li\u003e\n\u003cli\u003eBlock size: 60mm sheave diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eProduct Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eConfiguration: Double sheave with becket\u003c\/li\u003e\n\u003cli\u003eSheave diameter: 60mm\u003c\/li\u003e\n\u003cli\u003eLine range: 5\/16”–3\/8” (8–10mm)\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003eBearing: High-density free-spin plain bearing\u003c\/li\u003e\n\u003cli\u003eHead: Self-aligning swivel\u003c\/li\u003e\n\u003cli\u003eConstruction: Stainless steel straps, glass-fibre reinforced cheeks\u003c\/li\u003e\n\u003cli\u003eAttachment: Patented shackle post lock\u003c\/li\u003e\n\u003cli\u003eSKU: 239-29926005\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBest Use Case:\u003c\/strong\u003e The double-with-becket configuration is the workhorse of purchase systems — pair it with a single block to build a 3:1 or 4:1 mechanical advantage for mainsheets, vangs, or cunninghams. The becket gives you the fixed attachment point needed to anchor the purchase system, while the double sheave handles the working and standing parts of the line. The 60mm size is well-suited to mid-size performance sailboats where the 50mm feels undersized but the 72mm adds unnecessary weight.\u003c\/p\u003e\u003ch3\u003eOther 60mm Synchro Blocks\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-60mm-synchro-block-single-black-5-16-3-8-line-239-29926001bk\"\u003e60mm Synchro Block – Single, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-60mm-synchro-block-double-black-5-16-3-8-line-239-29926002bk\"\u003e60mm Synchro Block – Double, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-60mm-synchro-block-triple-black-5-16-3-8-line-239-29926003\"\u003e60mm Synchro Block – Triple, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-60mm-synchro-block-single-w-becket-black-5-16-3-8-line-239-29926004\"\u003e60mm Synchro Block – Single with Becket, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-60mm-synchro-triple-block-becket-cam-black-29926010bk\"\u003e60mm Synchro Block – Triple with Becket \u0026amp; Cam, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-60mm-synchro-block-fiddle-w-becket-black-5-16-3-8-line-239-29926034\"\u003e60mm Synchro Block – Fiddle with Becket, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-60mm-synchro-block-fiddle-w-cam-black-5-16-3-8-line-239-29926037\"\u003e60mm Synchro Block – Fiddle with Cam, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-60mm-synchro-halyard-block-black-29926021\"\u003e60mm Synchro Halyard Block, Black\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOther Synchro Block Sizes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-50mm-synchro-block-single-black-1-4-3-8-line-239-29925001bk\"\u003e50mm Synchro Blocks – 1\/4”–3\/8” Line\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-72mm-synchro-block-single-black-3-8-1-2-line-239-29927201\"\u003e72mm Synchro Blocks – 3\/8”–1\/2” Line\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lewmar-90mm-synchro-block-single-w-becket-black-1-2-9-16-line-239-29929004\"\u003e90mm Synchro Blocks – 1\/2”–9\/16” Line\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePair It With\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"\/products\/lewmar-synchro-snap-shackle-239-29926040\"\u003eLewmar Synchro Snap Shackle – 60mm\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250740527140,"sku":"239-29926005","price":153.02,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/eaa8a231-1432-4b44-abdf-d999e37f7e11.png?v=1787025847","url":"https:\/\/marisolmarine.com\/products\/lewmar-60mm-synchro-block-double-w-becket-black-5-16-3-8-line-239-29926005","provider":"Marisol Marine Company","version":"1.0","type":"link"}