Forney 72730 Wire Cup Brush, Fine Crimped with 1/4-Inch Hex Shank, 2-Inch-by-.008-Inch Designed for easy access into narrow holes and confined areas Crimped style for light to medium duty applications Removes rust, scale and paint in hard to reach areas 1/4-Inch (6.35-mm) hex shank Works with any power drill or pneumatic air drill