Check the listing for details. Used Lewmar60Mm Synchro Block Single. Color: Multi, Condition: Used. Listed at 29.99 USD. 12mm max rope diameter1160 kg max safe working load60mm sheave diameterincludes shackle From the Website Product DescriptionLewmar's Synchro Blocks are engineered for speed, efficiency and superior handling. We use a combination of scientifically optimised block geometry, a Free-Spin bearing and self-aligning head to reduce friction and increase efficiency by up to 40%, over budget blocks on mainsheet systems. Each component is perfectly synchronised with the movement of the rope, providing you with an easier, smoother transfer of power from deck to sail and less wear on your rope.Features Stainless steel strap for improved strength and longer service lifeStiff glass fibre reinforced cheeks to prevent lines from wedgingInnovative design with “tool-free” sliding swivel locking mechanismApplicationsPlain bearing blocks are typically used for heavy and static loads in:Halyard tuningMainsheet systemsMast foot blocksMast head blocksBoom vangPractical switch from swivelling to fixed shackle