Heavy duty aluminum construction. 250â€“pound weight capacity. Mar-resistant end caps. Interlocking 3-inch side rails for added stability. Smooth operating pulley. Slip-resistant 1-inch Traction-Tred D-rungs. Dimensions: 144L x 6W x 17.4H inches. Tall tasks are no problem with the Werner D1324-2 24 ft. Aluminum Extension Ladder. This ladder is built to last and features a durable construction of heavy duty aluminum and a smooth operating pulley system that makes for easy extension. Other features include mar-resistant end caps, interlocking 3-inch side rails, and slip-resistant 1-inch Traction-Tred D-rungs.