Zarges industrial extension ladders are tested and certified to both bs 2037 class 1 and en 131 their large d shaped serrated rungs provide a comfortable horizontal surface during use and the box section side stiles provide extra strength and smooth handling this ladder allows easy and precise rung by rung adjustment rung hooks and locking mechanisms lock the sections together when in use or closed for storage transport rungs and stiles made from extruded aluminium for extra strength and have a