The Adjustable Height Aluminum Gantry Crane AHA-6-8-10 combines lightweight and rigid construction into one unit. The all aluminum construction of this gantry crane makes it corrosion resistant and perfect for outdoor use. The lightweight I-beam allows height adjustment without the need of a hoist or a fork truck. Height is adjustable in 6" increments. Four-way locking 12” x 3-1/2” pneumatic casters included on adjustable cranes that are noted.