Stand up swivel block includes delrin base. Optional backing plate part number 97-60. Sheave Dia. 1-1/16" (27 mm), Max Line 5/16 (8 mm), Dia. includes urethane base 2" (51 mm), Height 3-5/32" (81 mm), H2 2-5/32" (55 mm), Fastener Size (3), #10 RH (5 mm), C/C 1-1/31" (26 mm), SWL 900lbs (410 kg), Weight Stain. 2.7 oz (76 g)