"The Phoenix 5/8in. x 4in. V-Belt Pulley is a heavy-duty split steel pulley fabricated from solid steel stock. Replacement for lawn and garden, farm and agricultural, and industrial equipment. U.S.A. Part Type Pulleys, Material Type Split steel, Bore Diameter in. 5/8, Pulley Diameter in. 4, Product Style V-belt pulley, Compatible With Outdoor power equipment. Heavy-duty split steel construction 3/16in. standard shaft keyway size 2 set screws are factory inserted for strength"