HARKEN 57 mm Aluminum Mast Collar ESP Block, 6050 Technology_Lightweight or other applications that require

or other applications that require a clean thru-deck lead

Through the use of advanced composites

Low-beam track is available with or without pinstop holes

mount a switchable ratchet in the cockpit and a boom-mounted Ratchamatic® directly above to allow double holding power in heavy air and to ensure the mainsheet runs freely in light air

HARKEN 57 mm Aluminum Mast Collar ESP Block, 6050 Technology_Lightweight or other applications that requireLow profile mastbase halyard lead blocks are lightweight and can be grouped in a small area at the mastbase. Flared cheeks prevent chafe on the halyards. The high load bearing system has a PTFE composite bushing and sideload balls. The sheave is hard coat anodized aluminum for additional strength. 57mm ESP Mastbase Teardrop Block. Designed to handle the high loads generated by modern racing and cruising boats, ESP blocks feature axle bearings to