Depressed Center Grinding Wheel Abrasive Material Ceramic Connector Size 5/8 In.-11 Connector Type Threaded Hole Grit 24 Overall Diameter 4 1/2 in Overall Thickness 0.25 in Primary Material Applicationn Stainless Steel Steel Compatible Tool Type Angle Grinder Series Saitech Ultimate Performance Wheel Type Type 27 Maximum Operating Speed 13 300 RPM Grade Extra Coarse