Made entirely of aluminum, Salsbury U.S.P.S. approved 4300 series mail package drops feature both a front and rear access locking door. Mail is deposited through a non-locking access panel on the front. Each unit includes an outgoing mail tray, a lock with two (2) keys on each door (keyed alike) and an adjustable red signal flag. Units are available in a black, white, green or silver powder coated finish. Mail package drops can be mounted on the optional bolt mounted (#4395) or in-ground mounted (#4385) aluminum pedestals or a base of your choice. ORDER PEDESTALS SEPARATELY. Non-locking thumb latches (related item #4388) are available as an option upon request. Mail package drops are approved for U.S.P.S. curbside mail delivery. Master postal lock not required.