China Bolt Nut and Washer Hexagon head bolts are commonly used in daily life, but not all hexagonal bolts are just right for you. There are no fewer than a thousand of its size and type. There are two distinctions between standard and special-shaped. If the appliance you use cannot be fastened with standard external hexagonal bolts, then only custom-made special-shaped external hexagonal bolts can be used for fastening. , Then the difference between special-shaped outer hexagonal bolts and standard outer hexagonal bolts is mainly that special-shaped outer hexagonal bolts can also be called (special-shaped screws), because they all belong to a kind of fasteners and belong to non-standard screws, so they are Called heteromorphic.China Bolt Nut and Washer website:http://www.chinaelectrictelecommunicate.com/bolt-nut-and-washer/