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The iron chain is machined by wire; Iron chains are generally divided into two categories according to their use: iron chains for jewelry and industrial chains; The chain of jewelry is divided according to the shape: side chain, O-chain, twist chain, 4D chain, child chain, anti-twist chain, bead chain, mesh chain, iron chain, double buckle chain, etc.; Jewelry, clothing, bags, crafts, etc.; Industrial chains are usually manufactured according to different standards. Currently commonly used standards are British standard (short, medium and long); American standard NACM84/90/96 (American standard chain); German standard DIN766, 763,764 (German standard chain) Australian standard (Australian standard chain), etc.;