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Modular concrete blocks:
Wall block systems are designed for easy assembly. This system has both 6-in.- and 3-in.-thick blocks in a variety of widths. A flange on the back evenly spaces and interlocks the wall. We used a "split-face, weathered" style, which is available in several colors. For other styles, visit the Web sites listed in the Buyer's Guide at the end of this article.