Double block features upset shackle for attaching to bails or padeyes. Sheave Dia. 1 1/16" (27mm), Thickness 1 1/8" (28mm), Width 1 3/16" (30mm), Length 3 9/32" (83mm), SWL 900 lbs, Weight 3 oz. (85g), Max Line 5/16" (8mm)