High Quality: The rotary drill bit set is made of high quality tungsten steel, processing hardness up to HRA 85, perfect for iron, steel, carbon steel, alloy steel, stainless steel, copper, aluminum, etc. Compatible with most rotary tools such as Dremel, Proxxon, Mister Tool, Einhell and similar machines. Shank diameter: 3mm. Cutting diameter: 6mm. Total length: 43.5-50mm. Multifunctional: This drill bit set can be used for engraving, chamfering, grooving, reaming, hollowing, etc. The processing efficiency is 10 times higher than the manual file tool, and almost 10 times higher than the small grinding wheel with handle. Wide Application: The rotary burr set can be used for engraving and milling soft wood, plastic and other soft materials, after carving, the surface is smooth. Portable: The rotary cutters come in a portable case, so no need to organize them. 10 Pieces Tungsten Carbide Rotary Cutter Burr Set - Grinding Head for Dremel Rotary Tools. Features: Material: Tungsten Steel.