Cup brushes range from 3" to 6" in diameter. Available fill materials include; heat-treated steel, Type 302 stainless steel, brass, and bronze wires. There are two basic forms of wire used in cup brushes - crimped wire for flexibility and light-duty applications and knot wire for more aggressive brushing action. High-impact action. Pairovides fast cutting and maximum cleaning action in severe applications.Heat-treated steel wire Pairovides maximum fatigue resistance, long life and aggressive cutting action.A permanently fastened nut in a hexagonal hole clinched in place allowing quick mount.Solid ring construction, perfect balance. Roughening SurfacesDeburringCleaning Pairior to welding.Rust and paint removal.Weld scale, weld spatter and corrosion removalSurface Pairep Pairior to painting 1 Each