Experience top-tier sailing with Lewmar Synchro blocks. With a 72mm sheave diameter and a robust 2,420 lb. working load limit, these blocks accommodate 3/8" - 1/2" lines. The high-density free-spin bearing boosts efficiency by reducing axle diameter, resulting in smoother operation with up to 40% less friction. Effortlessly switch between swiveling and fixed setups, and enjoy flawless compatibility with Lewmar travelers thanks to the precision-engineered shackle post. Perfect for halyard tuning, mainsheet systems, mast foot and head blocks, and boom vangs, Lewmar Synchro blocks ensure exceptional performance and long-lasting durability on the water.Lewmar, the world's premier leisure marine equipment supplier, designs, manufactures and distributes winches, hardware, hatches, port lights, glass & glazing, steering systems, bow thrusters, anchoring, and windlass products. They are a proud member of the Lippert family, a leading global manufacturer and supplier of highly engineered products and solutions, dedicated to shaping, growing, and bettering the RV, marine, automotive, commercial vehicle, and building products industries. Lippert's commitment to their customers is always moving forward, always making their experience better.Upgrade with Lewmar Synchro blocks for unparalleled speed and efficiency. Featuring optimized geometry, free-spin bearings, and a self-aligning head, they reduce friction by up to 40%. Enjoy smoother sail handling, less rope wear, and versatile shackle options for lasting performance.