Sturdy aluminum construction. 200-pound duty rating. Ideal for residential use. Traction Tred D-rung steps are deeply serrated. Smooth extension via rope and pulley system. Dimensions: 120L x 5.5W x 16H inches. Ideal for residential tasks such as painting, roofing, gutters and more, the Werner D1120-2 20 ft. Aluminum Extension Ladder gives you the height you need to get the job done. This ladder features a sturdy aluminum construction and offers a 200-pound duty rating. A rope and pulley system makes extension easy. Traction Tred D-rung steps are deeply serrated for sure footing.