Includes 6 common shapes: Dome cylinder, rounded shaft, concave arc with ball point, cone, cylinder, inverted cone. Dual chamber is more suitable for materials with relatively low density. Universal size - 6mm shank, compatible with all electric and cordless drills, pneumatic 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, hand-held 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. Uses: Clean burrs and burrs during casting, forging, welding, etc. mechanical bore surfaces. 1. The product is very sharp, please stay away from children. 2. The size is measured manually and there may be an error of 0-3 mm, which is normal. 3. Due to differences between different displays, the image may not reflect the actual color of the project. Size: as shown Delivery quantity: 6 pieces/set (see the main image for details).becomeveryrich