Jack is a kind of lifting tool with small volume, but it can produce great working ability and is suitable for narrow space. According to the driving mode, it can be divided into mechanical jack and hydraulic jack, also called hydraulic jack. Mechanical jacks lift heavy objects through gear rotation. Hydraulic jacks lift heavy objects through the pressure provided by hydraulic oil. Commonly used mechanical jacks include hand-operated overhead jacks, screw jacks and rack cranes. Nowadays, hydraulic jack is widely used, and the effect is better. The types of jacks here are "brand mall of hydraulic lifting equipment".