3 Series Cheek Block with anodized Aluminum cheek. Delrin(tm) plain bearing sheave ensures smooth operation and high safe working load. Stainless Steel base distributes loads to a larger surface area. Sheave Dia. 1-7/16" (37 mm), Max Line 7/16" (11 m), Length 2-7/8" (73 mm), Width 1-3/4" (44 mm), Height 3/4" (19 mm), Fasteners (4) #10- RH (5 mm), C/C 2-3/8" (60 mm), SWL 1000 lbs. (450 kg), Weight Alum. 2.5 oz. (71 g)