Convenient introductory set allows you to try similar brushes for your application. Set of 18 soft or hard animal hair end brushes with rubber coated ferrules to protect your work. Scratch-free cleaning of small parts for buffing and polishing features such as slots and groves using abrasive compounds. Use with flexible shaft, micromotor, or high-speed pencil die grinders. All on 1/8" shanks. Trim length ranges from 3/16", 1/4", 3/8", and 9/16". Ferrule diameters are slightly oversized and range from 3/16", 1/4", and 5/16". Maximum operating speed 15,000rpm.   All brushes are also available individually, sold in dozen quantities