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Cluster Box Units (CBU’s) manufactured by Salsbury Industries provide USPS access and offer a secure means of receiving mail and packages. They are ideal for commercial use or residential applications such as housing developments, apartments or townhouses. The 3300 Series is a USPS accessible CBU that includes a matching pedestal. Our cluster mailboxes are an excellent choice for durability because they are constructed of heavy-duty aluminum and stainless steel. See the additional features of our CBU’s below.