The Brumby 25mm Spindle-Mounted Crimped Cup Brush is best suited for light surface treatment and flexible brushing and deburring on application. The Crimped HD wire can be used on steel, brass, iron, plastic and wood. The Brumby 25mm Spindle-Mounted Crimped Cup Brush is fitted with a quick change 6.3mm hex shank. Suitable for use with drills.