Stand-Up Swivel with Ball Bearing Sheave 300-62Stand 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)