This jumbo size mailbos is constructed from heavy-duty galvanized steel and has a durable ribbed body for extra strength. Its extra large capacity can hold mail for days as well as small parcels. Steel latch and aluminum flag. Rust resistant powder coat finish. Engineered from quality galvanized steel for resistance against rustExtra-large size offers abundant space for high volumes of mail and large packagesThe powder-coated finish helps prevent discoloration from outdoor elementsRibbed body design adds strength and stabilityMailbox comes fully assembled. Mounting board, and hardware is sold separatelyCompatible with any Gibraltar Mailboxes post with the designation letter D