Features: Made of high quality tungsten steel, can be used to process iron, steel, carbon steel, alloy steel, copper, aluminum and other metals and marble, jade, bone and other non-metal. High production efficiency, the processing efficiency is several times higher than file, nearly 10 times higher than small wheel stalk. The machining efficiency is ten times higher than the manual file tool, and almost ten times higher than the small grinding wheel with the handle. In principle, the mining set can take place on the sm High product processing quality, high finish, can process out a various of high-precision mold cavity. Long life, the durability is 10 times higher than high-speed steel cutting tool, 200 times higher than small grinding wheel. Suitable for processing these metal and non-metal, such as cast iron, cast steel, bearing steel, high carbon steel, chrome-nickel alloy, bronze, brass, and ceramic tile, marble, jade, bone, etc. Widely used in machinery, automobile, shipbuilding, chemical, craft sculpture ect. Easy to grasp and use, safe and reliable. Specifications: Material: Cemented Carbide for Head Diameter: 6mm Rod Diameter: 3mm Color: As pictures shown Quantity: 10pcs/set Package Includes: 10pcs/set x Rotary Files- (other accessories demo in the picture is not included.) note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!