STURDY MATERIAL: Made of 1.5mm thick steel, this heavy duty metal lock box is not only long lasting, but also provides great protection for your house mail, letter, envelope, money, check, and keys for business office and home. SAFE SECURE: Our 12" x 4.25" x 15'' drop off safe comes with anti-fishing design for maximum security. This lockable tamper proof dropbox safe with slot can only be accessed with the designated key, and cannot be pried open by force. FRONT AND REAR ACCESS: Our key return box has a front slot for dropping off most business items during after hours. Authorized personnel can collect the items from the back using the key of this rear access locking mailbox. DURABLE LONGLASTING: This large metal mailbox is designed with 1.5mm industrial grade steel for durability. The powder coating finish on this key drop box with lock provides longevity and style for your modern metal mailbox. FITS MOST DOORS: This mailbox with lock and key can be mounted on wooden doors up to 1.75 inch, ideal as a residential and commercial mailbox. Hardware is included! (Note: this locking mailbox is a door drop box; NOT for wall.) GREAT FOR BUSINESS: Our back opening mailbox is a must have for offices. The door mailbox slot can collect delivery and use as a lock box for front door. Simply unlock this rear open mailbox to access your through door mail slot.