The Eaz-Lift Telescopic Jack has a zinc-plated inner tube and screw assembly. It is adjustable from 16" to 30". Its sturdy steel construction and powder coat for maximum rust protection has a certified 6000 pounds load capacity. It comes in a set of two. Sturdy steel construction 6000 pounds load capacity Adjustable from 16" to 30" Powder coated for maximum rust protection Set of 2