Lewmar is focused on making the lives of boaters easier. Our 72 mm synchro block, fiddle becket with cam does is designed for mainsheet and vang systems. Lewmar's innovative engineering has produced a replacement synchro block that performs to ball and roller blocks used in racing.The free spin bearing handles higher static loads, namely mainsheets and boom vangs. The larger sheave diameter minimizes rope friction. This block is compatible with lines ranging from 3/8"-1/2". This is synchronized with running rigging systems and is the ideal choice for sailors and allows an easy and smooth transfer of power from deck to sail.Lewmar, a renowned maker of luxury marine equipment, builds winches, hatches, port lights, glass and glazing products. The company is a proud member of the Lippert family, which produces highly engineered products for the RV, marine, automotive, commercial vehicle and building industries. Lippert's commitment to its customers is always moving forward: always making their experience better.Lewmar, a well-known name among boaters and boatbuilders across the globe, is the world's premier leisure marine equipment supplier, designs, manufacturers winches, hardware, hatches, anchoring and windlass products. Lewmar is proud member of Lippert, a leading, global manufacturer and supplier of products for the RV, marine, automotive, commercial vehicle, and building products industries. Lipper's commitment to their customers-always moving forward. Always making your outdoor experience, whether it is on land or water.