The Adjustable Height Aluminum Gantry Crane AHA-4-10-12 has a lightweight I-Beam allows height adjustment without the need of a hoist or fork truck. All pined connections make it possible for single person set up and take down in just minutes. Included are 2-straps, allowing 1-person to transport the gantry crane in one neat package. There is an optional total locking casters that lock the rigging in any position and locks the wheel from rotating. 4,000 lb uniform capacity. Heavy-duty welded aluminum construction for long lasting use. All units comply with applicable CMAA and ANSI specifications.