Depressed Center Grinding Wheel, Abrasive Material Aluminum Oxide, Connector Size 7/8 in, Connector Type Unthreaded Hole, Grit 46, Overall Diameter 4 1/2 in, Overall Thickness 0.25 in, Primary Material Application Aluminum, Brass, Copper, Compatible Tool Type Angle Grinder, Series A46N, Wheel Type Type 27, Maximum Operating Speed 13,300 RPM, Grade Coarse