3 Series Flat Base/Alum Cheek/Delrin Sheave 303-093 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)