8 Series Stand-up Block with Stainless Steel cheeks. Delrin(tm) sheave run on Nomex(tm)/Teflon(tm) bearing for a very strong yet low-friction sheave. Bolted construction allows for easy maintainence. Use 97-49 (sold sererately) for a solid backing plate. Sheave Dia. 2-3/8" (60 mm), Max Line 9/16" (14 mm), Dia. includes urethane base 3-3/8" (86 mm), Height 4-21/32" (118 mm), H2 2-15/32" (63 mm), Fastener Size (4),1/4" RH (6 mm), C/C 1-11/16" (43 mm), SWL 2750 lbs (1250 kg), Weight Stain. 15.8 oz (448 g)