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. Ref: UTTK5354