Triple block with becket, ball bearing sheaves and cam cleat. Delrin(tm) ball bearing sheaves provide low-friction operation. Adjustable cam bracket enables correct angle for sheeting. Fast entry cam cleats allow for easy line engagement. Works with 506-90 for 6:1 purchase. Sheave Dia. 2" (51mm), Thickness 2 5/16" (59mm), Width 4" (101mm), Length 5 17/32" (140mm), SWL 1500 lbs. (680kg), Weight 1lb. 3oz. (482g), Max Line 7/16" (11mm)