"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. Blade Application Ferrous metal, Blade Diameter in. 12, Blade Thickness in. 1/8, Max. RPM 6,300, Blades Included qty. 1, Arbor Size in. 7/8. Dimensions 12in. x 1/8in. x 22mm Maximum RPM 6300 Type Metal"