Diamond files are the main product of our factory,which is high efficient,good performance and hard wearing. Diamond File, Diamond Files, Diamond needle Files 1. By process: electrodeposition process, 2. The body: 45 steel material: high quality diamond metal bond: Nickel 3. Size: 120 #, 150 #4. Features: use it with high efficiency, low cost, the economic effect is good. 5. Usage: can be used to ...