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 Built-in Recessed Column Aluminum Locking Mailbox The 4140E series recessed mounted column mailboxes are ideal for columns, pilasters, masonry and walls.The rough opening dimensions for model #4140-E are 11.5" W x 11.5" H x 15.75" D. Column mailboxes may be used for USPS residential door mail delivery. Master postal lock not required.   | ||
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