33-03 Stainless Steel wire block with aluminum sheave. Aluminum sheave runs on our Nomex(tm)/Teflon(tm) bearing for low friction and high safe working load. Sheave Dia. 1-7/16" (37 mm), Max Wire 1/8" (3 mm), Pin dia. 3/16" (5 mm), L 2-15/16" (74 mm), W 1-9/16" (40 mm), T 13/32" (10 mm), SWL 1000 lbs. (453 kg), Weight 2 oz. (57 g), Max Wire 1/8" (3mm)