4C Standard Mailbox systems are constructed of heavy gauge aluminum with stainless steel components for maximum durability both indoors and out with an included shelter. This mail system includes two large parcel lockers for maximum delivery capabilities, as well as storage, of larger packages. The corrosion-resistant, weatherproof powdercoat finish protects this unit from the elements, while the riveted shelves and concealed hinges limit pry points for addedsecurity. The Mail Carrier access door provides easy access for Postal Letter Carriers to release the master loading doors. This mail receptacles meets the USPS 4C requirements which comply with ADA standards.