High-quality diamond file set designed for hard-to-reach & odd-shaped objects Ultra-hard industrial diamonds permanently embedded in steel shaft tip for superior material removal Use on extremely hard materials like hardened steel, carbide, titanium, stone, glass & tile Set of five 5-1/2" files - hook, flat hook, square hook, circle and flat/convex angle PVC-dipped handles provide excellent grip, average shaft diameter 3mm; 150 gri