Harbor Freight Round Pole Mailbox Bracket - Mailbox Shoppe Post Mount For Multiple Mailboxes Intended for use with our Locking Mailbox and Package Mailbox . This mailbox mounting board just made installing a mailbox easier than ever! This board mounts to a 4 by 4 inch wooden or plastic post and is compatible with any Gibraltar post mount mailbox Made from 12 guage wielded steel which is strong and durable. Architectural Mailboxes® Black Universal Mailbox Mounting Includes necessary hardware &38;clear instructions Accommodates Mail Boss&44; Package Master&44; or Mail Manager Shop for Mailbox Mount Bracket at . Save money. Live better This 3 Box Mail Boss Spreader Bar provides a convenient way for you to mount three mailboxes to one post which can save you space and give your yard a classy look. Mail Boss Spreader Bar 3 Box Features You can use with any of our posts or your existing wooden post. Comes in four powder coated finishes: black bronze granite or white.