Shackle is a rigging. Common shackle on the domestic market, according to the production standards are generally divided into national standard, American standard, Japanese standard three; the subject of the most commonly used among US, because of its small size and large weight bearing is widely used. Can be divided according to the type of G209 (BW), G210 (DW), G2130 (BX), G2150 (DX). Can be divided according to type bow (Omega-shaped) with a female bow shackle and D (U-type or straight) D-type shackle with a female; by the use of premises can be divided into two kinds of marine and land use. Safety factor of 4 times, 5 times, 6 times, 8 times even. The material, a common carbon steel, alloy steel, stainless steel, high strength steel. Surface treatment is generally divided into galvanized (hot dip and plating), painting, plating Dacromet. Shackles are widely used in electric power, metallurgy, petroleum, machinery, railway, chemical industry, ports, mining, construction and other industries. Common market, the US standard shackle specifications for 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.