Depressed Center Grinding Wheel, Abrasive Material Aluminum Oxide, Connector Size 5/8 In.-11, Connector Type Unthreaded Hole, Grit 30, Overall Diameter 5 in, Overall Thickness 0.25 in, Primary Material Applicationn Stainless Steel, Steel, Compatible Tool Type Angle Grinder, Series HP, Wheel Type Type 27, Maximum Operating Speed 12,200 RPM, Grade Extra Coarse