Sprite Science Carbide Burr Set Tungsten Rotary File Drill Bits Tools Cutter 1/8" Aluminum Long Shank Extreme hardness, high speed, high working efficiency, perfect grinding effect and long using life Processing cast iron, steel, stainless steel, copper, aluminum marble, jade, bone, nonmetal, etc Can be replaced with small grinding wheel convenient to grind, simple to use, safe and reliable Tungsten Carbide Material. 6 mm Cutting diameter. 3mm Shank diameter. 35mm Length. 45-50mm total Carving metallic and non-metallic surfaces. Using an engraving machine or mini drill various forms