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Private Access Cluster Box Units (CBU’s) manufactured by Salsbury Industries offer a secure means of receiving mail and packages. Private access mailboxes are excellent for communities that do not use the United States Postal Service to deliver mail. The Salsbury 3300 Series is a private 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.