Depressed Center -Off Wheel, Abrasive Material Zirconia Alumina, Connector Size 5/8 In.-11, Connector Type Threaded Hole, Grit 60, Overall Diameter 5 in, Overall Thickness 0.045 in, Primary Material Applicationn Steel, Compatible Tool Type Angle Grinder, Series The Ultimate , Wheel Type Type 27, Maximum Operating Speed 12,200 RPM, Grade High Performance