Approved to the required security upgrades of USPS-STD-4B+. Ideal for apartments, condominiums, commercial buildings and many other applications. Includes factory installed 0.75 in. W x 0.25 in. D trim and a solid rear cover . A front loading door panel swings on a continuous hinge . One mailbox opening is required for a master postal lock and cannot be used for mail distribution . Comes standard with lock and keys for each individual mailbox. Does not include master lock for U.S.P.S. entry; must be provided by U.S.P.S. . Made of Aluminum. 22.75 in. W x 16.5 in. D x 35.25 in. H (60?lbs.)