5 Pack of Crimped Wire Wheels (2-1/2" x .012" x 1/4" Hex Shank). Stem mounted 2-1/2" 'coarse' wire wheel brushes with 1/4" hex shank. 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. Use with any 1/4" diameter electric power drills or 1990 pneumatic (air) drill.