Description Double Fixed and Becket Conventional Sailboat Block Ball bearing design with long lasting characteristics. 39 mm sheave diameter Technical Description Features Metric American Working Load 600 lb 272.15 kg Breaking Load 2000 lb 907.18 kg Length 4.53 in 115 mm Sheave Diameter 2.24 in 39 mm Rope Line Max 0.39 in 10 mm Weight 0.26 lb 119 g