The Vestil Adjustable Height Aluminum Gantry Crane with Pneumatic caster AHA-15-10-10 is lightweight yet rigid and sturdy. All aluminum construction makes it corrosion resistant and perfect for outdoor use. The lightweight I-beam allows height adjustment without the need of a hoist or fork truck. All pinned connections make it possible for single person to set up and take down in just minutes. Included are 2 straps allowing 1 person to transport the gantry crane in one neat package. Unit comes standard with 4-position locking swivel casters with roller bearings that lock the rigging in 1 of 4 positions. You can set the wheels and push the gantry crane forward, back, left or right. Gantry crane is not to be moved while loaded.