In addition to being lightweight, aluminum ladders are corrosion resistant and unpainted. They are also non-magnetic. Both steps and top step are 16" or 24" wide, stairs are 7"deep and top step is 14" deep. All ladders are provided with 2" spring-loaded casters. Unpainted aluminum finish. UNA Grip premium serrated tread type. 350lb load rating. Series "A" aluminum ladders meet applicable OSHA and ANSI standards. CAL-OSHA models also available. Ships set-up direct from the mfg.