✔ Can process all kinds of metal(including all sorts of hardened steel) carbide, aluminum, and non-metal (such as marble, jade bone) ceramics, plastics, wood, fiberglass, simple to use, safe and reliable.✔ Technical data:The speed of the electric or pneumatic tools is usually 6000-50000 1/min revolutions per minute, machining hardness reach HRA≥85.✔ Works with mostly small rotary tools for DIY carving.✔ is recommended to use water as a lubricant when using these burrs. allowing them to be compatible with most die grinders and rotary tools as, grind and finish your work with precision.Package Included: 10 pieces 3X6MM Carbide rotary point and storage box