Features: Made of high-quality tungsten steel, high hardness, high strength, and durability; Can be used to process iron, steel, carbon steel, alloy steel, copper, aluminum and other metals and marble, jade-, bone and other non-metal. Double-cut- style has rows of cutting teeth cut in two intersecting directions for fast material removal and a rougher finish. Ideal-for ferrous and non-ferrous metals, wood, plastic and even stone cleaning, trimming, carving, cutting, shaping, grinding, welding, chamfering, casting, deburring, polishing and removing sharp-edges, ewelry making , cylinder head porting and sculpting. Compatible for most rotary tools and die grinders. easy to grasp and use, safe and reliable. Specifications: Material：Tungsten Steel Size:approx 3x6mm/0.12x0.24in Shaft Diameter: 3mm/0.12inch Cutting Edge Diameter: 6mm/0.24inch Quantity: 10pcs/set Package: White Plastic Box/ Blue Box Package Includes: 1 Set Rotary File Drill Bits note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you place order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!