The 72524 Werner Extension PLUS™ X4 2.41m Triple Box Section Reform Combination Ladder 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 or extension ladder mode. Suitable for professional use.