Commonly used alloy shackle, according to the production standards are generally divided into three categories: NATIONAL standard, American standard and Japanese standard; According to the form can be divided into bow (Omega) and D (U or straight); According to the use of occasions can be divided into Marine and land use two. The safety factor is 2x, 4x, 5x, 6x, or even 8x (such as super shackle). Its material, common carbon steel, alloy steel, stainless steel, high strength steel and so on. Surface treatment is generally divided into galvanized (hot plating and electroplating), paint, plastic coating. Rated load: common specifications on the market are 0.33T, 0.5T, 0.75t, 1T, 1.5T, 2T, 3.25T, 4.75T, 6.5T, 8.5T, 9.5T, 12T, 13.5T, 17T, 25T, 35T, 55T, 85T, 120T, 150T.At present, the largest alloy shackle in the world can reach more than 1000T.