The 8×18 trench box by Kundel is an all-steel trench box. It features up to 1.5 inch thick pounding pads. Placed on continuous vertical members. This makes for maximum durability for easy driving. Spreader sockets that are thick through wall pipe. Welded to the back plate and surrounded by steel. These are just a few of the many features that are standard on the Kundel 8×22 trench box and add-ons w/the competition.