Main BAI of jack should be used as vehicle repair zhi and other DAO work such as lifting and supporting in factories and mines, traffic and DU transportation departments.Its structure is light and firm, flexible and reliable, one person can carry and operate.

In principle, the most basic principle on which hydraulic transmission is based is PASCAL's law, which means that the pressure of a liquid is the same everywhere. The hydraulic jacks commonly seen make use of this principle to transfer force.