4C Standard Mailboxes are constructed of heavy gauge aluminum with stainless steel components for maximum durability both indoors and outdoors with an included shelter. This high-security mail receptacle includes 2 large parcel lockers for maximum delivery capabilities. The corrosion-resistant, weatherproof powdercoat finish protects the parcel units from the elements, while the riveted shelves and concealed hinges limit pry points for extra security. The Carrier Access Door Provides easy access for Postal Letter Carriers to release the master loading doors.