These key keepers are able to store a key to gain access to a secured area. They are USPS approved so the mail carrier can access your mail area. (A lock will need to be obtained from your local US post office). They are made out of 20 gauge steel and available in a recessed model and a surface mount model.
Surface mounted: 6"W x 3 1/4"H x 2"D
Recessed mounted: 5"W x 2 1/2"H x 1 3/4"D
Available in both aluminum and brass finishes