Burrs, conical point, single cut, length 22.2 mm, thickness 12.7 mm, made of alloy steel. Designed for professionals and DIY enthusiasts. Includes 6 common shapes: Domed cylinder, rounded shaft, concave arch with ball point, cone, cylinder, inverted cone. Dual chamber is more suitable for materials of relatively low density. Universal size - 6mm shank, compatible with all electric and cordless drills, air tools, grinders and other rotary tools. Durable and Reliable - Machining hardness reach up to HRA85. Can replace a small grinding wheel for most jobs, without creating dust pollution. Processing all types of metals (including all kinds of hardened steel) and non-metallic materials (such as marble, bone, jade) . Use on drills, presses, lathes, manual or flexible shaft electric or pneumatic devices. Can replace a small grinding wheel for most jobs, without creating dust pollution. Safe and reliable, can reduce labor intensity.