Made of cast aluminum, Salsbury 4100 series surface mounted modern mailboxes have a 10” W x 2-1/2 “ H solid brass mail flap with the word “MAIL” cast into it. Units are accessed from the front through a locking 10” W x 6-1/2” H door and include a gold finish lock with two (2) keys. A non-locking thumb latch (related item #4188) is available as an option upon request. Each unit features a durable powder coated finish available in four (4) contemporary colors and in two (2) door designs (plain and eagle). Modern mailboxes may be used for U.S.P.S. residential door mail delivery.