Stand up swivel block with aluminum cheeks and ball bearing sheave. Delrin(tm) ball bearing sheave ensures low-friction operation. Backing plate ordered separately # 97-60. Sheave Dia. 1-7/16" (37 mm), Max Line 7/16" (11 mm), Dia. includes urethane base 2" (51 mm), Height 3-17/32" (89 mm), H2 2-5/32" (55 mm), Fastener Size (4), #10 RH (5 mm), C/C 1-13/32" (26 mm), SWL 1000lbs (450 kg), Weight Alum.3.1 oz (88 g)