57mm Quad Block Swivel, Center Becket. Low-friction Carbo Air blocks are lightweight, strong and reliable. These compact blocks deliver very high working loads for safe, easy trimming and are companions to Harken Big Boat blocks. Features include 57 mm sheave diameter (2 1/4 in), maximum line diameter up to 10 mm (7/16 in) and very high working load capacity for demanding sailing applications. Includes one unit; durable plastic construction and warranty. Package dimensions: 5 x 4 x 3 inches; package weight ~12 ounces.
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