"High speed cut-off blade made for a wide range of grinding, shaping and cutting jobs in home workshops, farms and machine shops. Aluminum oxide is recommended for all types of ferrous metals. Wheel dimensions are diameter x thickness x arbor. Wheel Diameter in. 12, Wheel Thickness in. 1/8, Wheels qty. 1, Max. RPM 6,300, Recommended Use Ferrous metals, Arbor Size in. 7/8. Dimensions 12in. x 1/8in. x 22mm Maximum RPM 6300 Type Metal"