This next set of air operated jacks also double as a set of props. They can be used to lift and support fallen walls, trench sides, unstable vehicles or anything else the fire fighters can use them for. There is also a set of different jack heads which fit at the end of the cylinder. They come in different shapes and sizes depending on what needs to be lifted. The last picture shows a standard flat jack head which could be used for lifting a truck trailer or supporting a wall.