Single block with snap shackle attachment. Swivel head snap shackle may be secured in place with a simple set screw. Snap shackle attachment provides great flexibility. Sheave Dia. 2" (51mm), Thickness 15/16" (24mm), Width 2 1/8" (54mm), Length 4 7/8" (124mm), SWL 1750 lbs. (795kg), Weight 5.4oz. (153g), Max Line 7/16" (11mm)