57mm Swivel Mastbase Block

Complement our existing blocks in looks and functionality, but simpler in design and construction. Sheaves feature axle bearings to handle high static loads, and are ideal for halyards or limited purchase systems on cruising boats. 57mm ESP Blocks for line up to 16mm diameter, 75mm ESP Blocks for line up to 19mm diameter. Part Number: HK6059 Description: 57mm swivel mastbase block Maximum Working Load: 1135kg