List of featured suppliers of DOOR SPYHOLES on Building Products Index
A door spyhole is a small device that is installed on a door to allow a person on the inside to see who is on the other side of the door before opening it. It is usually a small, cylindrical device that has a lens on one end and allows the person on the inside to look through it to see who is on the other side. This device is commonly used in residential and commercial buildings as a security measure to prevent unwanted guests from entering without permission.