... request 2.Coating:nickle, chrome, titanium available 3.Packing:5pcs/set, or upon request Features:1.Shank diameter:6mm, 6.35mm ... request.2.Coating:nickle, chrome, titanium available.3.Packing:5pcs/set, or upon request.4.Used for shaping, smoothing and removal ... files are used for grinding hard materials,such as tungsten carbide steels,ceramic glass and sharpening and bore grinding of various ...