The Adjustable Knockdown Steel Gantry Crane AHSN-2-20-16 is uniquely designed to be disassembled when not in use for compact storage and easier transportation/shipping from one job site to another. Facilitate easy mobility from one area to another with four (4) 8" swivel casters with four-position locks (2K-4K models have glass filled nylon casters. 6K-8K models have phenolic casters. 10K model has steel casters). Features quick setup design. Height is adjustable in 6" increments. Do not move units while loaded. Painted blue finish. Requires assistance from fork truck to set-up.