Premium Material: Made of high quality tungsten steel, can be used to process: iron, steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, and marble, jade, bone and other non-metal. High Work Effenciency: The processing efficiency is dozens of times higher than the manual file tool, and nearly ten times higher than the small grinding wheel with handle. Basically, the potary burr set can take place from the small grinding wheel with handle, no dust and pollution are created. High Processing Quality: After carving, the surface is smooth, the carving tool can even process a variety of high-precision mold cavities. Long Service Life: This grinding head is easy to use, safe and reliable. Durability is ten times higher than high-speed steel tools and more than 200 times higher than small grinding wheels. Portable package: The 10pcs metal rotary burr set is packed in a small case, no need to organize always keep neat. Suitable for engraving, beveling, chamfering, grooving, reaming, hollowing. Product material: tungsten steel Specifications: shank diameter 3mm total length 43-51mm Processing range: can process cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals and marble, jade, bone and other non-metals Delivered quantity: 10 pieces/setbecomeveryrich