"The Phoenix 1in. 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. Pulley Diameter in. 4, Product Style V-belt pulley, Compatible With Outdoor power equipment, Part Type Pulleys, Bore Diameter in. 1, Material Type Split steel. Heavy-duty split steel construction 1/4in. standard shaft keyway size 2 set screws are factory inserted for strength"