The 4 in. x 4 in. Post Adapter can be used to attach any Architectural Mailboxes post mount mailbox to a 4 in. x 4 in. wood post. The adapter plate is constructed of heavy gauge galvanized steel and finished with a durable powder coat. The adapter includes mailbox mounting hardware and spacers used for T2 sized mailbox installation. Universal mounting plate Durable galvanized steel construction Multiple mounting patterns Includes installation instructions and assembly hardware Supports up to a 50 lbs. mailbox Limited lifetime structural warranty 100 % satisfaction guaranteed...