Yale P-9401-CH Door Viewer, fits doors 35mm to 57mm thick, Polished Chrome Finish, Standard Security, Visi Packed, suitable for external Wooden and PVC doors This front door Viewer has a wide angle lens that allows residents or those inside a property to see who is on their doorstop without having to open their door or compromise their safety. The peep holes for doors offer a large 120 degree viewing angle to allow maximum field of vision through your door. About this item Helps identify callers before opening the door Adjustable to fit door thickness 35 mm - 57 mm Suitable for wooden external doors Clear viewing lens 120-degree view Product Specification Door thickness: 35mm - 57mm Viewing angle: 120 degrees Body diameter: 12mm Glass Lens The high-quality finish gives the peephole for door an elegant touch to complement other door furniture. This peephole door viewer is a simple and easy solution for your security. The spy holes for doors give a clear view ensuring your privacy is maintained and easy identification of callers can be made. Due to its special universal design, the Yale door viewer can be installed in doors with a minimum thickness of 35mm to a maximum of 57mm. These door viewers are simple to install and can be done by anyone. A hole is drilled through the door with enough thickness for the peep hole to pass through. The door viewer can then be screwed in and used.