Designed for safety around electricity, the Werner 28 ft. Fiberglass D-Rung Extension Ladder features non-conductive side rails and a duty rating of 250 lbs. Its TRACTION-TRED D-rungs are slip-resistant for additional safety, and the side rails are interlocking, with rail shields that protect the bottom of the rail. The unique SHU-LOK feature allows the shoe to pivot easily for use on hard or penetrable surfaces, while the exclusive ALFLO rung joint guarantees twist-proof performance to ensures stability on a wide range of jobs.