Forney® Wire Wheel, 1-1/2 in Brush Diameter, 1/4 in Arbor, 0.12 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, Black/Gray