Made entirely of aluminum, Salsbury U.S.P.S. approved 4300 series mail chests 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 powder coated black, white, green or silver finish. 14 3/8 inches wide 17 1/4 inches high 23 inches deep Mail chests can be mounted on the optional bolt mounted (#4365) or in-ground mounted (#4385) aluminum pedestals or a base of your choice. ORDER PEDESTALS SEPARATELY Multiple mail chests can also be mounted on heavy duty aluminum spreaders (related items #4382 and #4383) and attached to any of the pedestals or can be mounted in columns, masonry or walls. Non-locking thumb latches (related item #4388) are available as an option upon request. Mail chests are approved for U.S.P.S. curbside mail delivery. Master postal lock not required.