Free Standing floor supported systems do not put stress on the building's overhead structure. Installation is usually more straight forward, and these cranes are also easier to relocate in the future. Free Standing systems require a reinforced concrete floor of at least 6 inches.  System capacities from 150 to 4000 lbs with a rectangular coverage area up to 34' Bridge and 124' runway standard.  Standard support distances of 20, 25, and 30 feet.  Freestanding system advantages are they are easy to move and position loads, modular design for greater flexibility, and do not require any existing support structures.