Single Padeye Block. Computer machined block finished in hardcoat anodized black for durability. Torlon(tm) rollers and Delrin(tm) ball bearings ensure a low-friction aluminum sheave that will handle high loads. Mounts to Schaefer 78-17 padeye. Flushing holes in each cheek allow easy flushing. Safe Working Load 5000 lbs (2270kg), 82mm sheave (3-7/32"), Length = 4-15/16" (126mm), Width = 3-7/32" (82mm), Thickness = 1-15/32" (37mm), Weight = 9.1 oz (258gm) Works with Schaefer 78-17 padeye.