Premium Material Made of high quality tungsten steel. it can be used to work on iron. steel. carbon steel. alloy steel. stainless steel. the copper. aluminum and other metals and marble. jade. bone and other non-metallic. High working efficiency The machining efficiency is tens of times that of the hand file and nearly ten times that of the small grinding wheel with handle. Fundamentally. the set of pottery mills can take place instead of the small millstone with the handle. no dust and pollution are created. Excellent processing quality After carving. the surface is smooth. the carving tool can even process a variety of high-precision mold cavities. Widely used for metal working. tool building. modeling. wood carving. jewelry making. the welding. chamfering. molding. the burr. grinding. etc Tough This grinding head is easy to use. safe and reliable. The service life is ten times that of high-speed steel tools and more than 200 times that of small grinding wheels. Portable package The set of 10 metal rotary cutters is packed in a small case. no need to organize it to keep it clean all the time. Suitable for engraving. chamfering. chamfering. the grooving. the bore. the hollow.