There are many specifications of explosion -proof hand pinoscoules, which are distinguished according to the load. The 1 -ton hand pour gourd uses a 6mm lifting chain. We know that the chain of the gourd in the hand is composed of a heavy chain and a fibrous zipper. Its standard chain length lifting chain is 3 meters, and the zipper is 2.5 meters. If the length of the lifting chain is 6 meters, the zipper is 5.5 meters. One ton of this specification is a single chain. As the load specification becomes larger, the chain will use 10 mm, and then the number of rows of the chain will be increased. For example, 5 tons are 10 mm dual chains.