What is hardware? It is a general term which refers to metal tools used in the building and furniture. There are a lot of hardware products. They can be grouped into big hardware and small hardware. The former refers to steel materials, such as steel plate, steel bar, channel iron, flat iron. The later often refers to the following items, such as construction hardware, tin plate, iron wire, household hardware, and tools. According to its property and function, the hardware also can be grouped into eight classifications, namely steel material, non-iron metal material, mechanical parts, transmission equipment, auxiliary tool, work tool, construction hollow stainless steel lever door handle and household hardware.Owing to the limited space and time, the article will mainly introduce the small hardware. It has a lot of varieties and specifications. It plays a very important role in the room decoration. Only through choosing the good hardware components can people use the decorating material safely and conveniently. At present, there are about hundreds of kinds of small hardware products in the market.The small hardware products in the market can be classified as follow:(a) Lock series: door lock, drawer lock, window lock, electric lock, lock body and so on. (b) Handle series: drawer handle, door handle. (c) Hardware for door and window: hinge, chain, bolt, floor spring, door close, patch fitting, plate, roller latch and so on. (d) Small hardware door household decoration: flexible wheel, air pipe, stainless steel dustbin, metal hanging brace, curtain rod, hand ring, seal strip, clothes hook, clothes hanger and so on. (e) Water and heating hardware: pipe, valve, floor drain, tape and so on. (f) Small hardware for construction: iron pipe, stainless steel pipe, plastic pipe, nail, bolt, screw, glass holder, insulating tape, aluminum alloy ladder, product bracket and so on. (g) Tools: steel saw, pincer, screw driver, measuring tape, drill and so on. (h) Sanitary hardware: tap, shower, soap rack, rack, mirror, soap dispenser, hand dryer and so on. (i) Kitchen hardware: sink, faucet, washer, cooker hood, gas stove, oven, water heater, pipeline, gas tank, sterilizer, rice cooker, hand blower, fridge and so on.