Product Description M22 alta one, type 1 articulating ladder, shrink wrapped, extension height 11' to 19', stepladder height 5' to 9', scaffolding height 5', storage height 5' 7", 250 lb rated. From the Manufacturer The Little Giant Alta-One Model 22-Inch hinge locks and telescoping sides let you safely use the Alta-One as an adjustable extension ladder, A-frame ladder, staircase ladder, and as a trestle-and-plank scaffolding system. Wide-flared legs, rubberized feet, and high-quality construction give you unmatched stability in any of its configurations. Because it is constructed of aerospace-grade aluminum, the Alta-One is ultra-light and ultra-strong. The Alta-One is rated to hold up to 250 lbs. on both sides, so it's perfect for medium-sized jobs.