Made of heavy duty aluminum, Salsbury 3312 series U.S.P.S. approved Cluster Box Units (CBU’s) are accessed from the front through two (2) easy opening master door panels and feature a durable powder coated finish. Each CBU includes one (1) fully integrated parcel locker and a matching pedestal. Each aluminum CBU door includes a heavy duty five (5) pin cylinder cam lock with a dust/rain shield and three (3) keys. Each door also has a 1 in. high number (1-13). One additional compartment in each unit is labeled Outgoing Mail and includes a weather protection flap and an 11-3/4 in. W x 3/4 in. H mail slot. Minor assembly is required. Salsbury Industries is officially licensed and authorized by the U.S. Postal Service to manufacture Cluster Box Units (CBU’s).