- Heavy duty ladder that provides low-cost roof or mezzanine access - Recommended for heights over 15 feet or when a Security Door is required - Lightweight and maintenance-free aluminum construction - 1-1/4″ patented deeply serrated square rungs for maximum grip and foot traction - Non-spark, high strength 6061-T6 alloy rungs and 6063-T5 alloy extrusions - Rungs capable of withstanding 1,500 lb. load - Standard floor mounted bracket included. Options for Off-floor Mounting Bracket with 7″ backset also available - Comes with standard mill finish but can be anodized or powder coated to any color or finish specified for additional cost