Depressed Center Grinding Wheel, Abrasive Material Ceramic, Connector Size 5/8 In.-11, Connector Type Threaded Hole, Grit 20, Overall Diameter 7 in, Overall Thickness 0.25 in, Primary Material Applicationn Cast Iron, Stainless Steel, Steel, Compatible Tool Type Angle Grinder, Series Quantum 3 SG, Wheel Type Type 28, Maximum Operating Speed 8,600 RPM, Color Black, Grade Extra Coarse