Hardware, refers to gold, silver, copper, iron, tin five metal materials, hardware is the mother of industry; the foundation of the national defense, hardware materials, is usually divided into two major types of hardware and hardware. Hardware refers to steel plate, reinforcing bar, flat iron, universal angle steel, trough iron, I-type iron and various types of steel materials. Hardware is for building hardware, iron sheet, lock nails, wire, steel wire mesh, wire scissors, household hardware, tools and so on. As for the nature and use of hardware, it should be divided into eight kinds of steel material, non iron metal material, mechanical machine parts, transmission equipment, auxiliary tools, working tools, building hardware, family hardware and so on