Depressed Center Grinding Wheel, Abrasive Material Zirconia Alumina, Connector Size 5/8 In.-11, Connector Type Threaded Hole, Grit 24, Overall Diameter 4 1/2 in, Overall Thickness 0.25 in, Primary Material Applicationn Stainless Steel, Steel, Compatible Tool Type Angle Grinder, Series Carbo Premier Red, Wheel Type Type 27, Maximum Operating Speed 13,580 RPM, Color Red, Grade Q