... 6.35mm, or upon request 2.Coating:nickle, chrome, titanium available 3.Packing:5pcs/set, or upon request Features:1.Shank ... 6.35mm, or upon request.2.Coating:nickle, chrome, titanium available.3.Packing:5pcs/set, or upon request.4.Used for ... Japan7. Customized design is acceptedThe files are used for grinding hard materials,such as tungsten carbide steels,ceramic glass and sharpening and bore grinding ...