Mailboxes 3505ARP Salsbury Vertical Mailbox (Includes Master Commercial Lock) - 5 Doors - Aluminum - Recessed Mounted - Private AccessMailboxes 3505ARP 4B+ Vertical mailboxes for Private Access 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, bronze and sandstone Rough opening for recessed mounted vertical mailboxes is 1 1 2" less than the unit's width, 1 1 4" less than the unit's height and equal to the