Convenient introductory sets allow you to try similar brushes for your application.
Cup brushes have a solid steel ring construction. Set of 10 crimped wire cup brushes, mounted on 1/8" shanks. Contains 2 each of the following: 0.003" and 0.005" Brass, 0.003" and 0.005" Steel, and 0.005" Stainless Steel. Use with flexible shaft, micromotor, or high-speed pencil die grinders.
Maximum operating speed 37,000rpm. All brushes are also available individually, sold in dozen quantities (see related products). Made in the USA.