Recessed Mounted – Private Access ( Features ) Mail drops for Private Access, May be used for U.S.P.S. residential door mail delivery. Constructed of 1/4″ thick aluminum plate and 20 gauge steel. Options; Etched or Black Filled Etching. Feature a durable powder coated finish available in aluminum, brass, green, sandstone and bronze. Feature a spring-loaded (11″ W x 4″ H) mail flap and an adjustable mail flap stop. Unit size: 14″ W x 7″ H x 6″ Rough opening: 12-1/4″ W x 5-1/2″ This includes a sleeve that goes thru the wall with an adjustable flap,to limit incoming opening.Leave your etching choice in the comment box on check out. Private/ US Mail/ Drop / Etc.