The D5916-2 16 ft fiberglass extension ladders feature a rounded rail for improved ergonomics while climbing and carrying. The non-conductive fiberglass rails are interlocking and the exclusive ALFLO® rung joint means TWIST-PROOF® performance every time. The TRACTION-TRED® D-rungs are slip resistant. These extension ladders are lightweight for transporting and maneuvering yet still have a duty rating of 225 lb.