Jack plays a significant role not only in the construction industry but also in maintenance and material handling. First, use for tire changing and vehicle repair Nearly every car is equipped with a jack stored in the trunk, usually under the trunk mat. Most vehicle-mounted jacks are rack-and-pinion type, which allow easy retraction of the lifting arm to complete lifting and lowering, assisting with car repair and tire replacement. When lifting a vehicle, pay attention to the supporting points: avoid fragile parts. Also, do not lift the car too high, as this may cause deformation or damage to the chassis, affecting both the appearance and performance of the vehicle. Second, use for heavy load moving Hydraulic jacks are highly useful for moving heavy objects. They are ideal for loads beyond human capacity or to reduce manual labor. There are various types of jacks, such as hydraulic jacks and low-profile jacks, serving different scenarios. In narrow spaces, low-profile jacks are preferred for their flexibility and high efficiency, making them widely applied. Third, use for tensioning steel strands A special type called the hollow hydraulic jack is composed of a tensioning cylinder, thrust piston, spring, and pressure cylinder. Its main function is to stretch steel bars and guide steel strands into position for fixing. This jack ensures accurate alignment and secure fastening of steel reinforcement. In short, hydraulic jacks have a wide range of practical applications in daily life and industrial work.