Auxiliary and accessory manufactured goods used in daily life and industrial production.Early mostly with gold, silver, copper, iron, tin and other metal materials made, hence the name.In addition to the use of a variety of metal materials, but also widely used plastic, glass fiber and other non-metallic materials made.Hardware products have played an important role in the human survival and development process.With the development of social economy and the refinement of social division of labor, hardware products are gradually enriched and improved, with more and more varieties.