Werner 20 Foot Aluminum Extension Ladder is a heavy-duty industrial ladder designed for durability and safety. It features deeply serrated, 1-3/4 inch wide flat type rungs that provide secure footing. The modified I-beam interlocking side rails are 3 inches wide, enhancing the ladder's strength. This ladder includes mar-resistant end caps and rail closures to protect surfaces and extend ladder life. Its smooth operating pulley system comes with a polypropylene rope, making it easy to extend and retract. Extruded rung locks with spring-activated nylon flippers ensure the ladder stays securely in place during use. The shoes rotate easily and lock into a spur position, allowing them to penetrate grass and dirt for added stability. This ladder is UL listed and labeled, meets OSHA standards, and carries a Type I heavy-duty industrial rating with a 250-pound load capacity, making it suitable for demanding tasks. Model Number: D1320-2