The Faithfull crimped brass wire circular brush designed for light to medium-duty applications such as cleaning metal surfaces prior to welding or painting. Fitted with a 6mm (1/4in) shank and are designed to operate with power tools up to a maximum of 4,500/min. Type: Circular Diameter: 75 mm Shaft: 6 mm (1/4in) Wire: 0.30 mm crimped brass wire Conforms to ISO 9001 and DIN EN1083-1 and 2.