The Little Giant Alta-One Model 17 is the lightest 17-foot multi-use ladder on the market. The Alta-One is the ultimate in strength, safety and versatility. You can count on quality performance for years to come. The hinge locks and telescoping sides let you safely use the Little Giant Alta-One as an adjustable extension ladder, A-frame ladder, staircase ladder, and as trestle-and-plank scaffolding system. Wide-flared legs, rubberized feet, and high-quality construction give you unmatched stability in any of its 24 unique configurations.