3 Series Double Over the Top Block. Stainless Steel cage and base provide a solid platform for clean leads. Delrin(tm) ball bearing sheaves ensure low-friction and high safe working loads. Sheave Dia. 1-7/16" (37 mm), Max line 7/16" (11 mm), L 2-11/32" (60 mm), W 2-11/16" (68 mm), H 2-11/32" (60 mm), Bearing Height 1-13/32" (36 mm), Fastners (6), #10 RH (5 mm), C/C 1-25/32" (45 mm), SWL 650 lbs. (295 kg), Weight 7.2 oz. (204 g)