Features and Benefits: Ideal for Cleaning and Blending Surfaces, Removing Light Burrs, Paint and Corrosion; Diameter: 4 in (101.6 millimeters); Arbor: 1/2 in (12.7 millimeters); Material: Steel; Wire: Coarse; Wire size: .012 in (.304 millimeters); Maximum revolutions per minute (RPM): 6,000; Tool type: For use with a bench, pedestal or straight grinder;