Jack is one of the indispensable tools in construction, auto repair, engineering geological survey and other projects, because of its small lifting height, light and strong structure, easy to carry and operate, and other advantages, is widely favored. But in some work ground is not normal, need to use jack base. After the jack is placed on the base of the jack, it needs to be moved when the position of the jack is fine-tuned. Because the weight of the jack is heavy, it is not easy to operate.
