1. Which one is more labor -saving? They are different from the principle. The spiral jack uses the principle of leverage, and the Pasca principle is used in the pound of hydraulic pounds. When using, hydraulic is relatively laborious. Self -weight of 2 kg: The spiral jack is mechanical, which is driven by gears. Therefore, the weight of the spiral jack of the same specification is larger than the weight of the hydraulic jack. 3. Price: The price of the spiral jack of the same specification is higher than the spiral jack top