10 Series Stand Up Block with Stainless Steel cheeks and Aluminum "universal circuit" ball bearing sheave. Aluminum sheave run on Delrin(tm) ball bearings for a very strong yet low-friction sheave. Stainless Steel base provides high safe working load when combined with optional backing plate part number 97-50. Bolted construction allows for easy maintainence. Sheave Dia. 3-1/4" (83 mm), Max Line 5/8" (16 mm), Dia. includes urethane base 4-1/2" (114 mm), Height 6-3/32" (155 mm), H2 3-1/8" (79 mm), Fastener Size (4),5/16" RH (8 mm), C/C 2-5/16" (59 mm), SWL 3750 lbs (1700 kg), Weight Stain. 2 lbs. 6.5 oz. (1.09 kg)