The E7400 Extension Trestle Ladders have a 300 pound duty rating per side and are designed for one or two-person jobs. The slip-resistant Traction-Tred extra wide steps are knee-braced and double riveted. A spring-loaded locking mechanism makes maneuvering the extension trestle easy. The nylon-coated guide sleeves assure minimum friction and wear and also increase the ease of operation. External rail shields and the EDGE bracing system help protect the rails. Fiberglass rails are non-conductive for working near electricity.