The Harken 57mm Carbo Flip Flop Block features a large 57mm sheave with ball bearings for smooth trimming and low friction, even under heavy loads with an added cam cleat. The block itself is built with lightweight and durable 6061-T6 aluminum cheeks that pivot on fiber-reinforced plastic chocks. All components, including the sheave, ball bearings, and sideplates, are UV-stabilized with carbon blacking.
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