Hydraulic jacks tend to be stronger and can lift heavier loads higher, and include bottle jacks and floor jacks. A BOTTLE JACK resembles a bottle in shape, having a cylindrical body and a neck, from which the hydraulic ram emerges. In a bottle jack the piston is vertical and directly supports a bearing pad that contacts the object being lifted. How to use? 1. Put the handle into the little pump piston handle yoke and push down with the force in your arm. 2. It loads with a little pressure but once it is in your control it works smoothly Functions: 1. Lifts vehicles so that maintenance can be performed. 2. They have a capacity of up to 50 tons and may be used to lift a variety of objects. Typical uses include the repair of automobiles and house foundations.