[Zincupered carbon steel] These coupling nuts are made of high resistance zinc -plated carbon and good corrosion resistance. [M10 in size 2] There is M10 * 50 * 14; M10 * 40 * 13 to choose to meet your different needs. [hexagonal] The nuts have adopted a hexagonal form on 6 sides which gives good granularity of the angles for paprot of a tool. [Good fixing performance] Used for mounting bolts, studs or metal screws for fixing two parts together. [Large applications] These long -up hexagonal nuts can be widely used for home and office, communication equipment, assembly of ships and other machinery industries.