Single block with stainless steel cheeks. Delrin(tm) sheave ensures smooth operation and high safe working load. Sheave Dia. 2" (51mm), Thickness 15/16" (24mm), Width 2 1/8" (54mm), Length 4 13/32" (112mm), SWL 1750 lbs. (795kg), Weight 7.1oz (201g), Max Line 7/16" (11mm)