Depressed Center Grinding Wheel, Abrasive Material Aluminum Oxide, 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 Application Stainless Steel, Steel, Compatible Tool Type Angle Grinder, Series PREDATOR, Wheel Type Type 27, Maximum Operating Speed 13,600 RPM, Color Black