Shackle is a kind of rigging, commonly used in the market shackle, according to the production standard is generally divided into national standard, American standard, Japanese standard three categories; Among them, the American standard is more commonly used because of its small volume and large weight and is widely used. According to the type can be divided into G209,G210, G2130, G2150 according to the type can be divided into bow type horseshoe type shackle and D type (U type or straight type) shackle; According to the place of use can be divided into Marine and land use two. The safety factor is 4 times, 5 times, 6 times. Its material, common carbon steel, alloy steel, stainless steel, high strength steel and so on. Surface treatment is generally divided into galvanizing (hot plating and electroplating), painting, plating.

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