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Keystone Lockable Insert by Gaines
A lockable insert is available for all new or existing Keystone Series Mailboxes. Installation is simple. The Lockbox slides into the front of the mailbox and secures with a single screw. Mail slot dimensions are 7W x 1.5H inches. Lock and two keys included. NOTE: The Keystone Mailbox is approved by the U.S. Postmaster General. Check with your local postal carrier to determine if the lockable insert option is acceptable in your area.