Depressed Center Grinding Wheel Abrasive Material Ceramic Connector Size 5/8 in Connector Type Unthreaded Hole Grit 20 Overall Diameter 4 in Overall Thickness 0.25 in Primary Material Applicationn Stainless Steel Steel Compatible Tool Type Angle Grinder Series Quantum 3 SG Wheel Type Type 27 Maximum Operating Speed 15 280 RPM Grade Extra Coarse