... Files, Diamond needle Files Diamond File, Diamond Files, Diamond needle Files 1. By process: electrodeposition process, ... economic effect is good. 5. Usage: can be used to file cutting hard materials, carbide, hardened mold finishing, high hardness steel ... flat, knife-shaped, single-sided triangle, the two circles, ellipses. 7. Main Specifications: 3 × 140 × 50, 4 × 160 × 60, 5 × 180 ...