Aluminum Oxide, Connector Size 1 1/4 in, Connector Type Unthreaded Hole, Grit 220, Overall Diameter 7 in, Overall Thickness 1/2 in, Compatible Tool Type Cylindrical Grinder, Surface Grinder, Tool and Cutter Grinder, Primary Material Application Nickel Alloy, Steel, Tool Steel, Specification 38A220-QV, Wheel Hardness Q, Wheel Type Type 1, Maximum Operating Speed 3, 600 RPM, Series 38A, Grade Very Fine, Bond Type Vitrified, Color Orange, Item Straight Grinding Wheel, Package Quantity 5. This item has been restricted from sale in the following state (s): []