Salsbury 3500 Series Vertical Mailboxes - Recessed Mounted - Private Access are ideal for colleges schools private postal centers corporate mail centers military bases government agencies and many other applications. Made entirely of aluminum. Feature a durable powder coated finish available in aluminum brass bronze sandstone and green. Rough opening for recessed mounted vertical mailboxes is 1-1/2 less than the units width 1-1/4 less than the units height and equal to the units depth. Fits into a rough opening and are secured with mounting hardware (not included) through the back or side panels. Units include a fully integrated flanged collar which fits over the rough opening. Doors and trim are striated to resist scratching. Mailboxes are available with 3 to 7 compartments. Salsbury Industries is an ISO 9001: 2008 certified company and has excelled in the field of manufacturing since 1936. SKU:KITCHB005F637UO