5PCS Double Cut Carbide Burr Set - 1/4 Inch Shank 10MM Head Die Grinder Bits Solid Carbide Rotary Burr File Set for Die Grinder Drill, Metal Carving,Polishing,Engraving,Drilling Specifications: -Length: 54-65mm -Drill Bit Head Diameter: 10mm -Shank Length: 54-65mm -Shank Diameter: 6mm -machining hardness: ≤HRC70 hardened steel Features: ➢Processing all kinds of metal(including all sorts of hardened steel) and non-metal (such as marble, jade bone),machining hardness reach ≤HRC70. ➢ For the most work it can be replaced with small grinding wheel,and no dust pollution. ➢Good machining quality,high degree of finish,can work out the high accuracy of various shapes mold cavity. ➢Service life is long,10 times higher than the durability of high speed steel cutter,200 times more than the small wheel durability. ➢Convenient control,using simple,safe and reliable,reduce labor intensity,improve the working environment. ➢Carbide rotary file generally use with handheld electric or pneumatic tool drive (can also be used in machine tool).The speed of the electric or pneumatic tools usually is 6000-50000 revolutions per minute. Uses Cleaning trimming,veining and weld joint of casting, forging and weldment. Finishing all kinds of metal molds. Impeller passage of finishing processing. A variety of mechanical parts chamfer,round and groove processing. Inner hole surface of machinery parts finishing. The process of various metal and nonmetal sculpture.