Single block with swivel eye. Delrin sheave on plain bearing allows for smooth operation and high static safe working loads. Sheave Dia. 1 1/16" (27mm), Thickness 19/32" (15mm), Width 1 3/16" (30mm), Length 2 3/4" (70mm), SWL 900 lbs, Weight 1.5oz. (43g), Max Line 5/16" (8mm)