HD Lens: The optical glass HD lens provides a crystal clear 200-degree view and super-wide coverage. You can see the entire surrounding area from the top of the head to the feet of a person outside. The door viewer provides top-quality security for you and your family. Anti-Tramp Protection: The door viewer has a 360-degree rotating privacy cover. By closing the peephole cover, outside visitors cannot see through the peephole into your home, providing the highest possible privacy for your protection and safety. Premium Quality: The peephole is made of solid brass, giving it a long lifespan. The peephole is available in several finishes with an elegant modern design that matches your existing hardware and decor and fits seamlessly with various doors. Easy Installation: The door viewers come with a 16mm drill bit and are suitable for doors from 35mm to 55mm. Simply drill a 16mm diameter hole, insert the peephole into the hole, then screw the two sides together and tighten by hand. (It is recommended to only drill halfway on each side of the door instead of drilling from one side of the door to the other). Wide Use: The modern security door viewer is suitable for homes, offices, hotels, and entrance doors. It is a must-have security addition wherever you need to see who is outside your door before opening it.