KD Tools 2313 KDT-2313 1" Crimped Wire-End BrushBrush removes dirt, rust and paint from metal and other surfaces. It is designed for general-purpose cleaning with 0.020" industrial crimped wire. Use in electrical drills, pneumatic tools or flexible shaft equipment. Face diameter: 1". Shank diameter: 1/4". Maximum safe free speed: 20,000 rpm.