Features： 1、Multiple Function: Rotary file bit set is designed to polish the impeller channel, grind the hole to an accurate shape, also suitable for wood carving, jewellery making, welding, etc. 2、Wide Range of Usages: Die grinder head is suitable for copper, aluminum, steel, marble, wood and other materials, can also be used in machinery, aviation, automobiles, ships, etc. 3、Durable Materials: Single cut rotary file bit is machined from advanced carbide materials which has high strength and hardness, excellent wear and heat resistant, long lasting to use. 4、High Efficiency: You can use the durable carbide grinding bit tool with pneumatic or handheld electric drive tools for higher working efficiency, stable performance and convenience. 5、Compact and Portable: Superior grinding head comes with simple and sturdy structure, small and light weight, easy and convenient to storage and transport with taking up less space. Specification： Item Type: Rotary File Set Material: Carbide Package Including: E0610M06, E0813M06, E1016M06, E1220M06, E1420M06 Letters represent the international number of this product, the first two digits are the diameter of the cutter head, the third and fourth digits are the length of the cutter head, M06 is the diameter of the handle is 6mm (unit is MM) Application: Machinery, aviation, automobiles, ships, etc. Package List： 5 x Rotary File Bit