The Wall Jack is used to raise walls and beams and tighten flooring and decking. Made of heavy duty, malleable cast iron, the wall jack rides up and down on a 2-by-4-foot pole, working like a car jack for dozens of construction uses. To lift walls and beams insert a length of ¾ inch to act as a lever. The Wall jack has a capacity of 1,000 pounds with the use of a 2x4. **Used only once like new