KD Tools 2314 KDT-2314 2-1/2" Wire Cup BrushBrush removes light scale, rust and paint from surfaces. It is designed for light-duty use with 0.014_ high carbon steel wire. Use in electric drills or flexible shaft equipment. Face diameter: 2-1/2_. Shank diameter: 1/4_. Maximum safe free speed: 5000 rpm.