Our small profile vertical mailboxes are designed to fit into smaller areas with minimal wall-space. Vertical mailboxes are not USPS approved for new installations. The USPS requires properties upgrade to current standards when any remodel or renovation occurs to the property. Any remodel big or small should drive an upgrade to CBU or 4C mailboxes. As these units are top-loading, they should be protected from the weather by installing indoors or under a covered area. Made from heavy-gauge extruded aluminum for durability with striated doors and trim to resist scratches. 5-pin cylinder locks help keep mail contents secure and each compartment features a tenant name card holder.