Round diamond Needle Files are used to enlarge round hole or cut scalloped edge. Mini needle file tool for fine detail work. The hardest abrasive surface - effective on hardened steel, glass, tile, stone, metal, etc. Widely used for art craft or jewelry field. Each file unique shape to cover full range shaping, forming, carving, engraving and material removal. Mini file allows access in really tight fits. Nonslip Handle for easy grip.