Constructed of heavy duty aluminum and stainless steel hardware, Salsbury 3900 series high security free standing 4C stand alone parcel locker mailboxes can be accessed from the front through two (2) easy opening master door panels. These units provide a convenient means of installing 4C horizontal mailboxes in locations where a wall mounted application is not desired or available. The 3900 series 4C free standing stand alone parcel lockers are durable and corrosion resistant that can be used indoors or outdoors and feature a powder coated finish in aluminum, bronze, gold and sandstone. All mailbox doors include a heavy-duty cam lock with a dust/rain shield and includes three (3) keys and carrier access door, which includes the U.S.P.S master lock access door (lock installed by the U.S.P.S). The 4C free standing unit include a U.S.P.S. approved 4C horizontal mailbox unit and matching enclosure. These free standing 4C horizontal stand alone parcel locker mailboxes allow tenants a convenient way to receive packages on site. Ideal for apartments, condominiums, commercial buildings, residential developments, colleges, schools, private postal centers, corporate mail centers, military bases, government agencies and many other applications. Salsbury Industries is an ISO 9001: 2008 certified company and has excelled in the field of manufacturing since 1936.