What about hardware?

Hardware, refers to gold, silver, copper, iron, tin five metal materials known as hardware for the mother of industry;

The foundation of national defense and the products of hardware materials are usually divided into two categories: hardware and hardware.

Major hardware refers to steel plate, rebar, flat iron, universal Angle steel, groove iron, i-iron and various types of steel materials, while minor hardware refers to building hardware, iron sheet, locking nails, iron wire, steel wire mesh, wire scissors, household hardware, various tools and so on. In terms of the nature and application of hardware, it shall be divided into eight categories: iron and steel materials, non-iron metal materials, mechanical parts, transmission equipment, auxiliary tools, working tools, building hardware, family hardware, etc.