The aluminum alloy hand holds a dual chain of 1.5 tons of gourds. Hand -pulling gourds are suitable for railway maintenance, the hands are light, and the self -weight is light. The aluminum alloy hand pulls the gourd is different from the iron hand to pull the gourd. Its main function is to traction tight line, so it is also called a threader. When we use the hand to pull the gourd, we must pay attention to the rated load of the gourd in the hand that cannot exceed the carrying capacity to avoid failure. Then check whether the parts of the chain hand tie gourd regularly are normal. If it is damaged, replace or repair it in time. In addition, it is necessary to avoid use in humidity, corrosive gases or flammable and explosive places to avoid failure.