Rotary burr, conical tip, single cut, length 22.2 mm, thickness 12.7 mm, alloy steel. Designed for professionals and DIYers. Includes 6 common shapesDomed cylinder, rounded shaft, concave arc with ball tip, cone, cylinder, inverted cone. Double chamber is more suitable for relatively low density materials. 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 kinds 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 electric or pneumatic devices. Can replace a small grinding wheel for most jobs, without creating dust pollution. Safe and reliable, can reduce labor intensity.