Locking foldable design saves on storage space when ladder is not in use. Ladder folds after unlocking spring-loaded detent pin. Once unit is folded, tilt back on wheels for easy portability. Available in either carbon steel or stainless steel. The steps are perforated to provide a non-slip surface. The ladders have 7" deep steps and a climb angle of 58 degrees. Stainless steel models are 202 grade. Complies with ANSI 14.7 and OSHA 1910.29 specifications.