Features: EASY INSTALLATION: Installing this door and window with detailed instructions is easy. Suitable for 35mm-55mm thick doors, pipe diameter: about 22mm, applicable aperture: 22mm25mm. Just drill a small pilot hole as straight as possible. You can replace your Door Viewer in 5 minutes without tools.HIGH QUALITY: The Door Scope is carefully made of high-quality Zinc alloy, and the electroplating process is used to make the Door Scope durable and can be used for a long time without frequent replacement.CLEARER VISION: Door Viewer adopts high-tech optical glass lens to ensure a clearer vision. The 220-degree viewing angle provides the safety of identifying visitors from behind a locked door, and you can easily view the entire surrounding area from the top of your head to the feet of the person standing outside.PRIVACY PROTECTION: The Wide Angle Door Viewer has a thick cover, which can be turned to cover the lens when not in use. After the protective cover is in place, even with the reverse peephole, people outside cannot see your home through the viewer.SOLID: Hardware Door Viewer a solid, heavy duty viewer cover increases your privacy. With the cover in place, visitors outside cannot see through the viewer into your home, offering the highest level of privacy for your protection and safety