LEWMAR 90mm Synchro Block - Swivel, 29929001BK Track_Traveler Cars They deliver dependable fast trim

They deliver dependable fast trim and release under high or low loads

The RF3133 universal joint with snap-on cover is designed to allow quick fitting and removal of the tiller extension from the fixed base

masthead blocks for external halyards

and a swivel lock self-aligning head to reduce friction and increase efficiency by up to 40% over budget blocks on mainsheet systems

Harken offers these patented

LEWMAR 90mm Synchro Block - Swivel, 29929001BK Track_Traveler Cars They deliver dependable fast trimThe 90mm single block is a workhorse and can be used in a wide range of applications. The larger sheave diameter works well with up to 9 16" lines and is an excellent choice for halyard turning blocks, mainsheet systems, masthead blocks for external halyards, and more. Synchro blocks combine geometry, sheave ratios, and a unique Free Spin bearing to deliver performance thats comparable to ball and roller bearing blocks used in racing but at a more