Ideal for apartments, condominiums, commercial buildings, colleges and schools and many other applications . Each Aluminum Mailbox door includes a five pin cylinder cam lock with two keys and a 2 in. W x 0.625 in. H clear Plastic card holder (card included) to identify the tenant"s name and/or box number . The Mailbox compartments are made of sheet Aluminum . Made entirely of Aluminum . Durable Powder Coated finish. 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.. 21 in. W x 12 in. D x 40.75 in. H (70?lbs.)