The general idea of hardware is mainly about five kinds of metal, such as gold, silver, copper, iron, tin. The traditional hardware products are all kinds of the metal devices that processed by physical working such as forging , rolling, and cutting and so on. Such as hardware tools, hardware components, daily used hardware, architectural hardware and security products and so on . but they are usually not the final products.    As an industry assistance product, semi-products, hardware are not usually a necessary tools in daily life. But hardware play an very important role in almost all the industry and commerce.