These Faithfull Diamond Needle Files are used in applications where the surface finish takes priority over fast stock removal rates and are most suited for smaller workpieces. They are often used by engineers and model makers where precision is required.The FAIPPDIAMOND set contains six precision diamond needle files fitted to comfortable soft-grip handles. Suitable for use on metal and plastic. The set comes in a plastic storage case and contains six shaped files as follows: Half Round, Round, Flat Taper, Square, Flat & Three Square. Specifications: Overall length: 150mm.Blade length: 100mm.Length of diamond: 50mm.