The 30-door standard rear-loading Guardian system is a secure, economical alternative to standard aluminum mailboxes. Each door comes with a new bent cam for added security, preventing the doors from being pried open. The secure mailbox housing is constructed of 24-gauge durable galvanneal steel.

This 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 lockable Guardian mailbox units are ideal for use in universities, military installations, and anyplace needing a private mail system.