Ousus Steel Factory offers a special non standard height aluminum wall ladders custom fabricated to exact field measurements, these ladders have been thoroughly tested for strength, and are able to withstand a 1500 lbs. loading without failure. Individual treads are attached to side rails using 4 rivets rated at 1100 lbs. shear strength each, and have been tested to 3,000 lbs. without deformation. Additionally, all edges on the side rails and treads have been rounded to provide a more comfortable, powerful grip for the hands. Safety cages are required on most ladders in excess of 6 meter in length to a maximum unbroken length of 9 meters (plus rail extensions). Cages are also recommended for shorter ladders at high or hazardous locations. Ousus Steel Factory offers this item as well as landing platforms as required by regulatory bodies.