Specifications:Size: 3mm x 140mmFile Type: FlatTotal Length: 140mm / 5.5" (approx.)Diamond-plated Length: 50mm / 1.97"Shank Size: 5mm / 0.2"Material: Diamond, Bearing Steel, PlasticFinish: Titanium CoatedPackage Include: 10pcs x Diamond Needle FilesDescriptions:1. 5.5" (140mm) total length, 1.97" (50mm) diamond working length. For working on small, delicate projects. Mainly used for processing hard material, quenched material, glass products etc.2. Suitable for shaping metal, wood, plastic, marble, stone. Especially perfect for finely grinding models and jewellery, instrument parts, and dies.3. Dipped handle provides firm and comfortable grip in use when exposed to fluid or moisture.4. Organized in a plastic pouch for dust-resistant storage.