"The Vestil Adjustable Height Gantry Crane is an all aluminum crane that features a lightweight I-beam for easy height adjustment without the need of a hoist or fork truck. Height is adjustable in 6-inch increments. Has a 122in.-146in. range and 6,000-lb. uniform capacity. Complies with CMAA and ANSI specifications. U.S.A. Easy height adjustments can be made in convenient 6in. increments Durable, heavy-duty welded aluminum construction is sturdy, yet lightweight Corrosion-resistant aluminum material for long life Includes four locking swivel casters with roller bearings for smooth rolling 4-position locking wheels allow you to push the crane forward, back, left or right for safe positioning All pinned connections for quick setup and takedown Includes 2 straps for easy transport in one neat package 54in. base width adds stability"