Depressed Center Grinding Wheel, Abrasive Material Zirconia Alumina, Connector Size 7/8 in, Connector Type Unthreaded Hole, Grit 24, Overall Diameter 4 1/2 in, Overall Thickness 0.25 in, Primary Material Application Stainless Steel, Steel, Compatible Tool Type Angle Grinder, Series Z24R, Wheel Type Type 27, Maximum Operating Speed 13,300 RPM, Grade Extra Coarse