The Adjustable Knockdown Steel Gantry Crane AHSN-4-20-12 is uniquely designed to be disassembled when not in use for compact storage and easier transportation/shipping from one job site to another. These cranes have all of the standard features of the AHS cranes with the added bonus of being able to disassemble the unit into a small storage envelope. These units facilitate easy mobility from one area to another with four 8" swivel casters with four-position locks. Height is adjustable in 6" increments. Do not move units while loaded. Painted blue finish. Requires assistance from fork truck to set-up.