Set of 10 Pcs of Black Bristle Wheel Brushes, Jewelers Tool, Fit DREMEL, FOREDOM Suitable for your DREMEL / FOREDOM machine tools. Ideal for cleaning & polishing metals 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 approximately 13/16" (20 mm) in diameter and is mounted to a 3/32" (2.35 mm) diameter mandrel.