Aluminum Oxide, Connector Size 1 1/4 in, Connector Type Unthreaded Hole, Grit 46, Overall Diameter 8 in, Overall Thickness 1 in, Compatible Tool Type Cylindrical Grinder, Surface Grinder, Tool and Cutter Grinder, Primary Material Applicationn Aluminum, Cast Iron, Stainless Steel, Steel, Tool Steel, Specification 32A46-IVBE, Wheel Hardness I, Wheel Type Type 1, Maximum Operating Speed 3,105 RPM, Series 32A, Grade Coarse, Bond Type Vitrified, Color Purple, Item Straight Grinding Wheel