Features: 1.Multi Purpose: Rotary file bit set is widely used for polishing the impeller channel, grinding the hole to an accurate shape, also suitable for wood carving, jewellery making, welding, etc. 2.Wide Application: Die grinder bit is suitable for copper, aluminum, steel, marble, wood and other materials, can also be used in machinery, aviation, automobiles, ships, etc. 3.Durable Carbide: Heavy duty Rotary File Bit is made of superior carbide materials which has high strength and toughness, excellent wear and heat resistant, long lasting to use. 4.Match to Use: 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 Size: Advanced carbide 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: FX0616M06,FX0818M06,FX1020M06,FX1225M06,FX1425M06 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.