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Form and function merge into one with Oaks Alterra wall stones. When large scale projects demand a steadfast product that is both attractive and reliable, Alterra is the perfect match. Its split-face wall system allows for either vertical or set back installations, for most typical gravity wall construction to 6" (1829mm) or to 10" (3048mm) with the extended unit. Engineer for higher height requirements, typical 40" (12,192mm), with grid reinforced stabilization.