"The Phoenix 5/8in. x 6in. 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. Compatible With Outdoor power equipment, Pulley Diameter in. 6, Bore Diameter in. 5/8, Product Style V-belt pulley, Material Type Split steel, Part Type Pulleys. Heavy-duty split steel construction 3/16in. standard shaft keyway size 2 set screws are factory inserted for strength"