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 removable Aluminum rear cover . All openings are usable . 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 29.75 in. H (55?lbs.)