Industrial Pro® premium heavy duty double row twist knot tempered steel wire cup brush. Provides fast, efficient weld cleaning, paint, rust and corrosion removal of large surfaces. For best results and long life, apply light pressure and use the wire ends only. Use with medium-sized high-speed angle grinders. Diameter: 4" Arbor: 5/8"-11 Wire Size: .020" (.508mm) RPM: 8,500