Abrasive Cutoff Wheel, Type 1, Diameter 4 In., Thickness 0.040 In., Max. RPM 15280, Material Silicon Carbide, Arbor Hole 5/8 In., Diamond Knockout No, Wheel Type Ultra Thin ReinforcedApplication Masonry and Non Ferrous Metals Reinforced Cut-Off WheelsUse for a variety of applications with portable or stationary machines. Choose from wheels for cutting sheet metal, steel, studs, nonferrous materials, or concrete/masonry applications.