Foot 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. Top cheek will swivel out of place for easy installation. Flushing holes in each cheek allow easy flushing. M100-10 Foot Block. Safe Working Load 7500 lbs (3410kg), Weight 25.2oz (717gm), Max. Line 3/4" (19mm), Sheave Diameter 4" (100mm), Length 5.8" (140mm), Width 4" (100mm), Requires (4) 3/8" (10mm) Flat Head Fasteners.