Architectural Mailboxes Oasis Mailbox, White Postmaster General approved and patented design allows delivery of mail bundles and small parcels - perfect for Internet and catalog shoppers Body constructed of heavy 16 and 14 gauge galvanized steel fully powder coated prior to assembly for durability and long life Doors include rubber seals to keep deliveries clean and dry - all hardware made from stainless steel and other corrosion resistant materials Suitable for installation into a pilaster, column or wall - the entire outer shroud is one piece to resist moisture and the elements Use Universal Adapter Plate 5530 for 4x4 wood post installation