The standard 20-door rear-loading Guardian system is a secure and economical alternative to standard aluminum mailboxes. Each door is designed with a new bent cam for added security, preventing the doors from being pried open. The secure mailbox housing is made of 24-gauge durable galvanneal steel.

The high-security Guardian system is designed to be stacked two units high, mounted side by side, or between standard wall studs. All units have identical outside dimensions, allowing you to mix & match different door sizes. These locking Guardian mailboxes are ideal for universities, military installations, and anyplace needing a private mail system.