4B+ Horizontal Mailbox with 12 B-Sized Doors, Rear Loading, Private Access12 Door Rear Loading Mailbox The 4B+ Horizontal Mailbox offers secure private access with 12 B sized doors, made entirely of durable aluminum with a powder coated finish. Ideal for private postal centers, schools, and corporate mail centers. Key Features: Durable Construction: Made entirely of aluminum with a powder coated finish. Secure Locking System: Features 5 pin cylinder cam locks with 2 keys. Spacious Compartments: Includes 12 B sized doors for