MarchInn 12V DC 5.0T(11000lb)The MarchInn 12 Volt Automatic Electric Car Repair Tool Kit is worth having for emergency roadside tire change and repair. Conventional ways of changing tires are probably the worst job for car owners. An electric car jack can make it simple which saves a massive amount of time and energy. Provide sufficient torque to raise the vehicle without any manual labor. There is no need to use mechanical scissor jacks or hand cranks to change tires.The electric car jack is a unique piece of tool, which is far different from manual jack in terms of force ratio. Force ratio is the difference between input and output forces. As stated in the table below, manual jacks require more torque/input force and less turns to raise a vehicle that is done manually