Shackle, also known as hanging buckle, is a crane in the rigging of a kind, according to the form can be divided into: bow and D type. Shackle the material is generally carbon steel, alloy steel, stainless steel and so on. The surface of the shackle will be treated with rust, such as galvanized or painted to prevent rust corrosion. Shackles can be divided into marine and land use, widely used in electric power, metallurgy, petroleum, chemical industry.