Designed for indoor or outdoor use, this heavy duty mailbox enclosure allows 4C modules to easily be mounted to any flat surface.  A mounting collar is included with all 4C-SM modules and is ideal for settings with limited wall depth or material that makes it difficult to cut in a rough opening.  The surface collar matches the 4C module ensuring your final installation achieves a sleek, finished look while the easy-to-assemble slotted back design of the collar also simplifies installation.