The D6016-2 16 feet fiberglass extension ladders have non-conductive side rails and a duty rating of 250 lbs. The Traction-Tred D rungs are slip resistant and the side rails are interlocking. The rail shields protect the bottom of the rail and the Shu-Lok shoe pivots easily for use on hard or penetrable surfaces. The exclusive Alflo rung joint guarantees Twist-Proof performance.