1. Diamond file is perfect for fine detail work.It allows precise filing in hard to arrive areas on metal, wood, plastic, etc.2. The files are coated with industrial diamonds to create the hardest abrasive surface available. 3. The hardest abrasive surface - effectively file and shape steel, glass, tile, stone, metal, etc.4. Nonslip plastic dipped Handle for easy and comfortable grip.5. These needle files can satisfy your different needs. Widely used for art craft. Comes with a plastic pouch for easy organization and storage.6. These popular precision files are indispensable mechanic tool for mechanics, electronics repair, woodworking and other applications.