The Shure-Step safety step stools are heavy-duty step stands rated for 500 pounds for use by A&P mechanics around, on, and inside aircraft. These steps are made of lightweight plastic so if you accidentally bump them into the exterior of an aircraft they won't hurt it, unlike the metal stands. No legs! So they won’t wobble on uneven surfaces. Comes in a bright yellow so it’s easy to see or black to hide to grease and grime. Six large rubber pads on the bottom keep the step from slipping on smooth hangar floors. They are stackable, so if your work is just a little out of reach, just throw another stool on top. These steps grow 6 inches with each added step. For more information visit www.AircraftStepStools.com or call (800) 273-7866 or (713) 956-5240.