9 Pc Nylon Wire Wheel Brush Rotary Suit for Dremel 3000 4000 8220-2/28 395 7700-1/15 4000 3/34 Chicago Electric, Milwaukeen Nextec 1/8" Shank Hobbyy Clean Polish 9 Nylon Wire Brush w/ 1/8" Shank Wheel Brush: approx 0.9" in dia,Cup Brush : approx 0.6" in dia, Pen Brush: approx 0.2" in dia Supplied with 1/8" diameter shank drill mandrel arbor for easy fitting in any drill Great addition to your Hobby Craft tool kit.