The D1320-2 aluminum 20 ft extension ladder has a duty rating of 250 lb and heavy-duty modified I-beam side rails. The TRACTION-TRED® D-rungs are slip resistant and the side rails are interlocking. Heavy-duty, spring-loaded locks operate smoothly. Durable shoes rest flat or are held in spur position with SHU-LOK® feature. Mar-resistant end caps help protect the surface ladder is leaning against. Exclusive ALFLO® rung joint means TWIST-PROOF® performance every time.