Features: Carbide rotary files, also known as tungsten steel rolling mill, process a variety of metals (including hardened steel) and non-metallic (such as marble, jade, bone), wood carving choice! Processing hardness can be up to HRC70. In a great part of working, it can replace Petiole small wheel. No dust pollution. High production efficiency, the processing efficiency higher than small wheel stalk nearly ten times. It is an important tool to improve production efficiency and achieve fitter mechanization jobs. Specification: 100% brand new Color: Sliver Material: Tungsten carbide Size: as picture shows Fit for: Finishing all kinds of metal mold, all kinds of metal and nonmetal carving, parts Processing, etc. Package included: 5pcs x Cutter files