The Adjustable Height Aluminum Gantry Crane AHS-6-15-9 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 1-neat package. There is an optional Total Locking Casters that lock the rigging in any position and locks the wheel from rotating. Heavy-duty welded aluminum construction for long lasting use. Each unit includes 4-swivel nylon casters with 4-way position locks for safe positioning. 6,000 lb uniform capacity.