At Mailboxes.com, we offer discount mailbox solutions for commercial and residential applications. Our mail drops are popular for commercial applications. Constructed of 20 gauge steel and 1/4'' aluminum plate, Salsbury recessed mounted mail drops have a spring-loaded flap. They feature a durable powder coated finish available in three (3) contemporary colors. Custom engraving (related item #2265) is available as an option upon request. Mail drops are ideal for collecting documents and small packages and may be used for U.S.P.S. residential delivery. Master postal locks not required.