Labor saving wrench is a newly designed wheel wrench for easy loosen truck tires or car tires by using less labour to reach a sufficient output torque, especially is suitable for tightening and dismantling large diameter bolts and nuts.
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In principle, the hydraulic jack is based on Pascal principle, that is, the pressure of the liquid is the same everywhere, so in a balanced system, the pressure exerted on the smaller piston is relatively small, and the pressure exerted on the larger piston is also relatively large, which can keep t