Architectural Mailboxes Oasis Classic Large High Security Parcel 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 18 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 or column - the entire outer shroud is one piece to resist moisture and the elements 18-Inch d x 15-Inch h x 11.5-Inch w, 23-Pound - Use Adapter Plate 7530-10 for 4x4 wood post installation