4"Blu Fine Nyalox Mountd Wheel Maintains shape & will not rust. Will not shed bristles under normal conditions. Abrasive grit is impregnated throughout each bristle. Safer to use, will not puncture skin. 3" & 4" Mandrel mounted wheel brushes, ideal for getting into crevices and contou rs. Applications: Removing paints, corrosion, weld scale, surface rust & burns from metals. Prepare plastic, fiberglass, & rubber surfaces for adhesives. Preparing metal surfaces for primers & paint. Cleaning unfinished tile, stone, cement, and brick mor tar. Removing old paint and finishes from wood. Cleaning & sanding wood turnings, railings, banisters, trim & molding. Rounding and blending edges, cutouts and joinings.