This folding ladder is made of heavy duty carbon steel with a weight capacity of 350 lbs. It has 2 locking casters for easy portability and can be folded to save space. The four perforated steps offer a non-slip surface with 7" between each step. The ladder complies with ANSI 14.7 and OSHA 1910.29 specifications. Total dimensions 35" x 24" x 62" (W x D x H).