Larger inner compartment can accept a USPS priority mail large flat rate box 12 in. x 12 in. x 5.5 in. Fully powder-coated for corrosion resistance Hole patterns accommodate side or bottom mounting Discover the exquisite Knighthood Antique Gold Reindeer Head Lapel Pin. Perfect for men, this accessory adds a touch of sophistication to any coat or suit The Centennial Mailbox by Architectural Mailboxes is the first design to receive United States Postal Service approval against the new USPS Standard... Railing Mount Mailbox at Claire Loucks blog Together, this high-capacity mailbox bundled with a heavy-duty mounting board creates a complete solution for reliably managing high mail and parcel volumes. Compatible with most mailboxes of all sizes - check mailbox manufacturer's product specifications to ensure hole pattern matches mounting board Large Mailbox Architectural Mailboxes Centennial Black, Extra Large, Steel, Post Mailbox Post Adapter Sleek magnetic door closure provides reliability all while keeping door firmly closed Predrilled 4 in. x 10 in. Made from heavy-duty galvanized steel Complementing the mailbox, the steel mounting board easily installs on 4x4 posts to provide a sturdy foundation. The Centennial XL mailbox features an extra-large 14 x 12 x 18.3 inch compartment that fits USPS priority boxes up to 12 x 12 x 5.5 inches. and still has room for additional mail and parcels