Alternating Tread Stair Unit Material Steel Number of Steps 15 Handrails Included Yes Load Capacity 350 lb Climbing Angle 56 Degrees Step Tread Perforated Step Width 9 1/8 in Step Depth 10 1/2 in Base Depth 81 5/8 in Overall Height 150 1/4 in Color Yellow Standards OSHA 29 CFR 1910.25(e) Overall Width 23 1/2 in