1. 【】 Rotary end mills, conical tip, single cut, length 22.2mm, thickness 12.7mm, made of alloy steel. Designed for professionals and DIY enthusiasts. 2. 【】 Includes 6 common shapes: Domed Cylinder, Round Shaft, Concave Arch with Ball Point, Cone, Cylinder, Inverted Cone. 3. 【】 Double chamber is more suitable for relatively low density material. 4. 【】 Universal size - 6mm shank, compatible with all electric and cordless drills, air tools, grinders and other rotary tools. Durable and Reliable - Machining hardness up to HRA85. Can replace a small grinding wheel for most jobs, without creating dust pollution. 5. 【】 Processing of all types of metals (including all kinds of hardened steel) and non-metallic materials (such as marble, bone, jade). Use on drills, presses, lathes, electric or pneumatic manual devices or with or flexible shaft. Can replace a small grinding wheel for most jobs, without creating dust pollution. Safe and reliable, can reduce labor intensity.