The Werner Extension PLUS™ X4 4.07m closed length Combination Ladder features box section stiles that are designed to ensure the ladder is lightweight but strong. With slip-resistant D shaped rungs & manual thumb operated locking catches to prevent sections separating This ladder is ideal to be used in a trade environment. With 3 sections this product can be used in stepladder freestanding extension ladder stairwell ladder or extension ladder mode. Approved to the new EN131 standard for Professional Use.