The Harken 57mm Flip Flop Block features a large 57mm sheave with ball bearings for smooth trimming and low friction, even under heavy loads. The key innovation lies in its hinged construction. 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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