Rotary Cutter, Tapered Head, Single Cut, 25mm Long, 13mm Thick, Alloy Steel. Designed for professionals and DIYers. Includes 6 common shapes: domed cylinder, round shaft, concave arc with spherical tip, cone, cylinder, inverted cone. Double cavity is best suited for relatively low density materials. Universal size - 6mm shank, compatible with all cordless drills, electric drills, air tools, grinders and other rotary tools. Durable and Reliable - Mills to HRA85 hardness and replaces small grinding wheels for most jobs without dust contamination. Machines all types of metals (including all types of hardened steel) and non-metallic materials (marble, bone, jade, etc.). Can be used on drills, presses, lathes, manual or flexible shaft electric or pneumatic equipment. Can replace small grinding wheels to do most of the work without dust pollution. Safe and reliable, it reduces labor intensity. Package includes: 1 set of rotating grinding head. (Other products are not included) DISCLAIMER 1) Due to manual measurements, there may be a deviation of 1-3 cm. 2) Actual color may vary slightly from the photo due to differences in monitor and lighting.