Burrs, Conical Point, Single Cut, 22.2mm Length, 12.7mm Thickness, Made of Alloy Steel. Designed for professionals and DIY enthusiasts. Includes 6 common shapes: Domed cylinder, rounded shaft, concave arc with ball point, cone, cylinder, inverted cone. Double chamber is more suitable for materials with 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 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, 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. Packing list: 6 pieces of rotary cutter.