Portable ladders for use around warehouses hardware stores or inventory rooms. Tilt the unit to allow for portability. Units roll on 4" poly-on wheels. Constructed of square tubing framework which handles uniform capacities up to 350 lb features 30"H removable hand railing (36" on 12-Step models), access chain, 21"D top platform and an industrial baked-in blue powder-coated finish for toughness. Each step measures 24"W x 7"D and is spaced 10" apart. Model with 5- to 12-Steps are ship crated some assembly required. Complies with ANSI A14.7 and OSHA 1910.29 specifications.