One style of locking security mailboxes are aluminum mailboxes. They come with different door sizes and styles. Locking security doors come with optional mail slots, windows and engraved letters or numbers to help process the mail faster and more accurate. Aluminum mailbox systems can be designed for the corporate lobby either recessed into a wall or free standing. They also can be designed for outside use.

Curbside mailboxes are another style of locking security mailboxes. These boxes are designed for outside use and their purpose is for a central location for the delivery of the mail. Charnstrom has a variety of sizes and designs of locking security mailboxes.

Charnstrom sells and manufactures a complete line of mail center and office organizing furniture.