Double side 3ft plastic rail protectors to avoid manhole rim damage, heavy duty gussets under steps and new heavy-duty 180° boots that allow you to work on either side of the ladder with thick non-marring thermoplastic elastomer tread bonded and mechanically fastened to the upper boot. The polypropylene copolymer upper boot provides strength, durability and fiberglass protection. This ladder is specially designed for use in manholes and meets or exceeds the safety standards set by ANSI, CSA, and OSHA.   375lb load capacity, ANSI Type IAA rated.  Rail depth: 3 1/4". Inside width: 12 1/8". Outside width: 14. 1/2".