The Lessmann DIY Cup Brush is fitted with 6mm shank. It has been designed for working on large surfaces, generally for the removal of rust, paint, dirt or scale, and for polishing. 430.123.07 Wire 0.35 Steel, Diameter 50mm. 430.133.07 Wire 0.35 Steel, Diameter 75mm. 430.126.07 Wire 0.25 Brass, Diameter 50mm. The Lessmann DIY Cup Brush has the following specification Wire 0.25 Brass. Diameter 50mm. Max/Min 4.500.