Aluminum Oxide, Connector Size 1 1/2 in, Connector Type Unthreaded Hole, Grit 24, Overall Diameter 14 in, Overall Thickness 2 1/2 in, Compatible Tool Type Bench Grinder, Pedestal Grinder, Primary Material Applicationn Aluminum, Brass, Bronze, Cast Iron, Copper, Nickel Alloy, Stainless Steel, Steel, Titanium, Tool Steel, Specification 57A24-QVBE, Wheel Hardness Q, Wheel Type Type 1, Maximum Operating Speed 2,320 RPM, Reducer Bushing Size 1 in, 1 1/4 in, Series 57A, Grade Extra Coarse