Chain Accessories The shape of the shackle resembles the capital letter D, hence the name. According to the place of use, it can be divided into two types: marine and land. The safety factor is 4 times, 5 times, 6 times, or even 8 times (such as the Swedish GUNNEBO super shackle). Anchor Chain Fittings Its materials, common carbon steel, alloy steel, stainless steel, high-strength steel and so on. Surface treatment is generally divided into galvanizing (hot-dip and electroplating), painting, and Dacormet.Chain Fittings