The Werner X300000 Extension Ladder WalkThru is designed to fit most Werner ladder profiles. Fully compatible with Werner ladders from Type II to Special Duty Type IAA. The Extension Ladder WalkThru has enhanced stability with a dual clamping system that locks the rail extensions onto ladder rails. The WalkThru also has a wide base which provides additional contact area on the work surface while transitioning. The ladder rung latch spring mechanism fits securely in place on Werner ladders. The violator labels and caution markings on the WalkThru provide good visibility on the job site. The Extension Ladder WalkThru meets compliance standards OSHA 1910 & 1926.