Depressed Center Grinding Wheel Abrasive Material Zirconia Alumina/Silicon Carbide Connector Size 7/8 in Connector Type Unthreaded Hole Grit 24 Overall Diameter 9 in Overall Thickness 0.25 in Primary Material Applicationn Stainless Steel Steel Compatible Tool Type Angle Grinder Series Blue Fire ZC Wheel Type Type 27 Maximum Operating Speed 6 600 RPM Grade Extra Coarse