Precision offers a complete line of aluminum wall ladders custom fabricated to exact field measurements. Precision's ladder treads are a full 2-1/4" in width and they are deeply serrated to maximize traction. These ladders have been thoroughly tested for strength, and are able to withstand a 1500# loading without failure. Individual treads are attached to siderails using 4 rivets rated at 1100 lbs. shear strength each, and have been tested to 3,000# without deformation. Additionally, all edges on the siderails and treads have been rounded to provide a more comfortable, powerful grip for the hands. Ladders in excess of 24' length must be equipped with a personal fall arrest system, ladder safety system, cage, or well. Precision offers cages as well as landing platforms as required by OSHA 1910 Subpart D and other regulatory bodies in certain situations. Mill finish is standard.