Material: bearing steel Color: silver + black Shank size: 6mm round shank Handle length: 30mm Cutting edge diameter: 12.7 mm Total length: 55 mm Long life: more than 200 times the wheel. Uses: Clean burrs and burrs during casting, forging, welding, etc. mechanical bore surfaces. Package included: 6pcs rotary tiller 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.