4" x 5/8" (101 x 76mm) double pulley with an aluminum sheave, stainless steel side plates and sealed needle bearings. Bearings decrease the amount of surface area in contact with the axle, which creates a more efficient transfer. By rolling the load around the axle, load on the transfer point is increased, which results in faster wear, shortening the life of the pulley. Min breaking strength 25,000 lbf. (111.2 kN). Weight 64 oz. (1,816 g) Made in the U.S.A.