I bought my church’s Western Red Cedar veg garden raised beds from Rhino Garden Supply. The beds are 12” tall. But two 6” panels are used to create a 12” high side. You can see that the ends of the panels are pre-drilled with holes. You simply stack one panel on top of the other, line up the holes and drop the 12” long bolt provided in the kit into the hole. Voila! Instant 12” panel.