Stand up swivel block with aluminum cheeks. Delrin(tm) sheave ensures smooth operation and high safe working load. 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 (3), #10 RH (5 mm), C/C 1-1/31" (26 mm), SWL 1000lbs (450 kg), Weight Alum. 3.1 oz. (89 g)