This Firepower 1423-2121 Crimped Type Carbon Steel Wire Wheel Brush has a 6-inch diameter, a 1/2-inch width, 0.014-inch wire size, 5/8"-1/2" arbor hole and a maximum RPM of 6,000. Firepower wire wheel brushes are designed for tough jobs. Each wheel contains an equal number evenly-distributed, top quality high carbon tempered wires, which gives the wheel an exact balance and long-life. Firepower brushes are well-suited for use in the welding and fabricating industries. They are used for surface preparation prior to welding and brazing and for removing weld scale and spatter after the welding operation.