Shure-Step provides several models of safety step stools for aircraft maintenance and passenger use. They are light-weight (9 or 10 pounds), heavy-duty (rated for 500 pounds) step stools that can take abuse on the tarmac or in the hangar without breaking. They keep mechanics safe while working on aircraft or ground equipment. These step stools won't tip or slip when standing on them because of their pyramid design. Two of the Shure-Step models grow 6 inches when stacked so if you have a short mechanic or need to reach a little higher to perform a task, just throw another step on top of the one you're using. For more information visit www.Shure-Step.com.