9 Rotary Brass Wire Brush Wheel Dremel 3000 4000 1/8" Shank Hobbyy Clean Polish 9 Brass Brush w/ 1/8" Shank 3-Wheel Brush: approx 0.9" in dia,3-Cup Brush : approx 0.6" in dia, 3-Pen Brush: approx 0.2" in dia Supplied with 1/8" diameter shank drill mandrel arbor for easy fitting in any drill Solid steel shanks with corrosion resistant Made from soft brass for safe on most material w/ low speed, m