Carbon Steel Wire 2-3/4" Dia Knot Style Cup Brush 5 Pack,Brush 5 Pack Carbon Steel Wire 2-3/4" Dia Knot Style Cup, Provides fast, efficient welding cleaning, paint, rust and corrosion removal on large surfaces, Arbor Size: 5/8"-11,2-3/4" Dia Knot Style Cup Brush - Carbon Steel Wire, Material: Carbon Steel Wire, Shape: Cup, Cup Brush 5 Pack Carbon Steel Wire 2-3/4" Dia Knot Style.