Tackle tough cleaning jobs with this AUPREX wire brush set! You get 6 heavy-duty brushes total: four 4-inch knotted wire wheels and two 3-inch knotted wire cup brushes. Made from tough 0.02\ knotted high-carbon steel wires, they're perfect for aggressively stripping rust, peeling off old paint, removing weld spatter and burrs, or cleaning up corrosion from metal surfaces. They fit any standard 4-1/2 inch angle grinder with a 5/8-11 UNC threaded arbor (the most common size). The wires are held securely between double-sided steel plates to prevent them from flying out, making them safer and longer-lasting. The 4-inch wheels are great for large, flat areas, while the 3-inch cups get into corners and edges. Rated for speeds up to 12,500 RPM. Whether you're prepping for a new paint job, restoring a tool, or cleaning up after welding, this set has the right brush for the job. Save money by buying the pack!