Depressed Center Grinding Wheel Abrasive Material Aluminum Oxide Connector Size 7/8 in Connector Type Unthreaded Hole Grit 30 Overall Diameter 6 in Overall Thickness 0.25 in Primary Material Applicationn Stainless Steel Compatible Tool Type Angle Grinder Series A30S Wheel Type Type 27 Maximum Operating Speed 10 100 RPM Grade Extra Coarse