Locking Insert for Keystone Mailbox, Item Number: GMZMKSLOCKING, $56 includes Lockable Insert with 2 Keys, Insert Box: 5-3/4"H x 9-1/8"W x 18-1/2"D, Insert Slot: 1-1/2"H x 7"W, Weight: 3 lbs., constructed of extra-strong powder coated sheet aluminum with reinforced hinges, leaves enough room above for your outgoing mail, Check with your local postal carrier to determine if the lockable insert box option is approved in your area

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