Collection Unit for 7-Door High 4B+ Mailbox Units - Bronze - Rear Loading - USPS AccessCollection Unit for 7 Door Mailbox Units The Collection Unit is designed for 7 door high 4B+ mailbox units, featuring a durable bronze construction and rear loading access. It is USPS approved, ensuring secure and efficient mail collection. Key Features: Durable Construction: Made from high quality bronze for long lasting use. Rear Loading Access: Convenient design for easy mail collection. USPS Approved: Meets USPS standards for secure mail handling.