Gibraltar Mailboxes Reliant Large Capacity Galvanized Steel, Post-Mount, MB981B01, Black Large, deep capacity mailbox accepts letters and packages through 1.75"H x 10" W slot Heavy-duty galvanized steel construction increases strength and performance Concealed locking compartment protects deliveries and comes with two access keys Compatible with any Gibraltar Mailboxes post with the letter code C Mounting board and hardware are sold separately