Half-Moon hinged base block. Heavy duty Stainless Steel base and cage ensure high strength. SS Springs keep block upright. Aluminum UC sheave features Nomex(tm)/Teflon(tm) bearing with Delrin(tm) ball bearings for a low-friction high strength sheave. Sheave Dia. 2-3/8" (60 mm), Max Line 3/8" (10 mm), Length 4-5/8" (118 mm), Width 3/4" (19 mm), Height 3-3/16" (97 mm), Bearing Height 1-7/16" (37 mm), Fasteners (4), 1/4" FH (6 mm), C/C 3-15/16" (84 mm), SWL 3000 lbs. (1361 kg), Weight 14.5 oz. (411 g)