Single Ball Bearing BlockSingle block with aluminum cheeks and ball bearing sheave. Delrin™ ball bearing sheave ensures low-friction operation. Swivel head may be locked in place to avoid twist.Specifications:Sheave Diameter 2" (51mm)Thickness 15/16" (24mm)Width 2 1/8" (54mm)Length 4 13/32" (112mm)SWL 1500 lbs. (680kg)Weight 5oz. (142g)Max Line 7/16" (11mm)