Depressed Center Cut-Off Wheel Abrasive Material Aluminum Oxide Connector Size 7/8 in Connector Type Unthreaded Hole Grit 60 Overall Diameter 4 1/2 in Overall Thickness 0.0625 in Primary Material Applicationn Cast Iron Stainless Steel Steel Compatible Tool Type Angle Grinder Series ZIP+XTRA Wheel Type Type 27 Maximum Operating Speed 10 200 RPM