Depressed Center Grinding Wheel Abrasive Material Aluminum Oxide Connector Size 5/8 In.-11 Connector Type Threaded Hole Grit 60 Overall Diameter 4 1/2 in Overall Thickness 0.25 in Primary Material Applicationn Aluminum Brass Copper Stainless Steel Steel Compatible Tool Type Angle Grinder Series Flexcut Wheel Type Type 29 Maximum Operating Speed 13 300 RPM Grade Medium