Set of 10 Pcs of Brass Pencil Brushes, Polishing Tool, Fit DREMEL & FOREDOM Suitable for your DREMEL / FOREDOM machine tools. Ideal for removing rust/corrosions from any metal surfaces (e.g.: steel, aluminum, zinc alloy, brass, copper, etc.), especially precious metals. Perfect accessories for jewelers, locksmiths, gunsmith, technicians, coin collectors, archeologist, students, hobbyists etc. Each brush is mounted to a 3/32" (2.35 mm) diameter mandrel.