The D1228-2 aluminum 28 ft extension ladder has a duty rating of 225 lb and interlocking side rails. The TRACTION-TRED® D-rungs are slip resistant. Spring-loaded locks operate smoothly for easy operation. 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.