The Jet 133106 6″ Single Sheave is built from rugged cast iron with bronze bushings and a ball-type oiler. Rated for 2 ton capacity, tested to 150% for added safety, it handles 5/8″ rope on a 1-1/8″ bore. At just 1-5/16″ thick, it offers reliable performance for lifting and rigging applications (excluding snatch or yarding blocks).