Stand up swivel block with aluminum cheeks and ball bearing sheave. Delrin(tm) ball bearing sheave ensures low-friction. Backing plate ordered separately # 97-48. Sheave Dia. 2" (51 mm), Max Line 7/16" (11 mm), Dia. includes urethane base 2-7/8" (73 mm), Height 4-1/32" (103 mm), H2 2-3/32" (54 mm), Fastener Size (4), #10 RH (5 mm), C/C 1-12/31" (36 mm), SWL 1750 lbs. (790 kg), Weight Alum. 7.0 oz. (332 g)