The parcel lockers offer tenants a convenient way to receive packages on site and are fit with a two key security system. When the USPS delivers a parcel to the locker, a parcel locker key is placed in the recipent's mailbox. Once the recipient opens the parcel locker, the key is automatically retained in the lock until it is removed with a control key. The units have 1/4" thick extruded aluminum doors with a durable powder coated aluminum finish and are equipped with a hinged rear door which allows access from the rear. Parcel lockers are designed to fit into the rack ladder and free standing mail centers, each sold separately. One door is selected and also available in the option menu in a two door unit. One door unit dimensions: 23.5"W x 12.125"H x 15.5"D - Two Door Unit Dimensions: 23.5"W x 12.125"H x 15.5"D