Forney® Wheel Brush, 2 in Brush Diameter, 0.012 in Bristle Diameter, Crimped Bristle, Steel Bristle, 6000 rpm Maximum Speed, 1/4 in Shank, Shank Mounting, For Use With: 1/4 in Dia Electric Power Drills and Pneumatic Drills, Additional Information: Hex Shank