The jacks work in accordance with the hydraulic principle. Our jacks feature compactness small body light and weight portability. They are useful tools for automobiles. Lightweight Design & Heavy Duty Performance. Heavy Duty Steel Construction Provides Rigidity and Stability. 4 ton (8000 lb) Capacity with a Min. Lifting Height of 4.5 and a Max. Dual Piston Pump Allows you to Easily Lift the Jack up to Desired Height. Designed with Large Steel Casters and 360-Degree Swivel Casters for Smooth Maneuverability and Easy Mobility. 100% Brand New Installation instruction is...