This Faithfull crimped steel Wire Cup Brush is designed for light to medium-duty applications, such as cleaning metal surfaces prior to welding or painting.The wire brush is fitted with a 6mm (1/4in) shank and is designed to operate with power tools with a maximum speed of 4,500/min.Type: Cup. The FAIWBS75 Wire Cup Brush has the following specifications: Face Diameter: 75 mm. Shaft: 6 mm (1/4in). Wire: 0.3 mm crimped steel wire. Conforms to ISO9001. and DIN EN1083-1 and 2.