Use the 6-inch Nicolock Colonial Wall System when you want to create large-scale walls and structures that still have a classic appearance. These solid retaining wall blocks have a double-sided, hard-split rock face texture. In addition to walls, you can build stairs, landings, fire pits, planters, and piers. For added character and depth, our 6-inch Colonial wall blocks can be paired with the three-inch Mini Colonial Wall System.