This Louisville 4 foot aluminum mobile platform ladder has a 300 lb load capacity, rated ANSI Type IA. It has a bodyweight activated caster technology system that allows it to be mobile and easy to use. This ladder features a slip-resistant platform with a top rail guard and handrails, heavy duty gusset bracing, angled aluminum slip-resistant rubber feet, and double-rivet step construction. The Louisville AP5004 mobile platform step ladder meets or exceeds the safety standards set by ANSI, CSA, and OSHA.