Forney 72266 End Brush, Coarse Twist Knotted with 1/4-Inch Shank, 3/4-Inch-by-.020-Inch Stem mounted wire end brush Designed for easy access into narrow holes and confined areas Twist knot for heavy duty applications Removes rust, scale and paint in hard to reach areas Use with any 1/4-Inch diameter electric power drill or pneumatic air drill