The inner length of the lifting chain is usually three times the diameter. The lifting chain has high hardness, large tension and many specifications. Not only can it be made into a sling of a ring chain, but it can also be used as a lifting chain of an electric hoist in chain block. Chain block's commonly used specifications are 6mm, 8mm and 10mm. Choose different specifications of chains according to different tonnage. It should be noted that the 10 mm lifting chain is used from 5 tons. The tonnage becomes larger, and the chain is added to meet the required lifting requirements. The surface of the chain can be primary color and blackened.