Cup brushes range from 3" to 6" in diameter. Available fil 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. Highly corrosion resistant. recommended where contamination or "after rust" is a Pairoblem, such as brushing stainless steel or non-ferrous metals. All Weiler stainless steel brushes are made with Type 302 stainless steel wire. Cleaning rust, scale, paint, oxidation on large metal surfaces.Weld CleaningDeburringEdge BlendingSurface PaireparationRoughening Surfaces 1 Each