The D1510-1 10ft One-Section Aluminum Straight Ladder has a duty rating of 300 pounds. The exclusive ALFLO® rung joint means TWIST-PROOF® performance every time. The side rails are extra heavy duty I-beam rails and the Aluminum TRACTION-TRED® D rungs are slip resistant. The rugged shoe rests flat or is heldin spur position with the SHU-LOK® feature for use on hard or penetrable surfaces.