Stop Using Wire Brushes. Sick of discovering wire bristles in your favorite sweatshirt? Now there is a better, longer lasting, safer alternative. The 3-M Radial Bristle Brush is made from a plastic like material that's uniformly impregnated with abrasive. As the wheel wears, fresh abrasive is exposed to assure consistent cutting action. Includes push-out sleeve adapters to fit motor shafts from 1/2in. to 1in.. Six inch diameter 8 ply wheel with 1/2in. face Maximum RPM 10,000 Yellow (80 Grit). Ideal for removing light rust and old finishes.