Depressed Center Grinding Wheel Abrasive Material Ceramic Connector Size 7/8 in Connector Type Unthreaded Hole Grit 20 Overall Diameter 6 in Overall Thickness 0.25 in Primary Material Applicationn Stainless Steel Steel Compatible Tool Type Angle Grinder Series NorZon Plus SGZ Wheel Type Type 27 Maximum Operating Speed 10 185 RPM Grade Extra Coarse