HD Lens: HD Optical Glass Lens Offers 220 Degree Crystal Clear Panoramic View an Extraordinary Wide Angle Coverage.It covers the area from the porch ceiling to the doormat, extending to both sides of the doorway across the street.You can spot packages without opening the door and easily see anyone present outside from head to toe. It offers the highest quality security for you and your family High-Quality Materials and Structure: Our peephole door viewer is made of high-quality brass materials and high-definition glass lenses. Compared with door eyeholes made of semi-metal or zinc alloy, it has higher rust resistance and durability Privacy Cover: Heavy Duty Privacy Cover Provides Top Privacy and Security-With the cover in place, no one from outside can see through the viewer into your home even with the reverse peephole.You can open and close the heavy duty back cover flexibly and smoothly. It allows you to identify visitors from a locked door, offering the highest level of privacy for your protection and safety Easy to Install: Use a (28mm/1 7/64'') drill bit to make the hole, Door viewer suitable for 1 21/32" to 2 1/8" (42mm-54mm) thick doors, simply drill a suitably positioned 1 7/64″-1 3/16″ (28-30 mm)diameter hole, insert the viewer into the hole then screw the two sides together and tighten by hand Widely Used: Built to Last Construction, The door viewer gives a lifetime of durability. It comes in multiple finishes with sleek contemporary design to match your existing hardware and decor, blending in perfectly with various doors. A must safety complement for home, office, hotel and anywhere you need to view who is outside your door before opening Hardware insists on providing high quality products, preferential price for you. We sincerely hope that our products can make your home comfortable, safe, relaxed and artistic. Premium products can save your time and money and promote our long-term cooperation in the future. Stylish designed door viewer peepholes are widely used as common decor in hotels, offices and front doors of every family.​ Most importantly, consisting of 4 layers of optical HD lens provides 220 -degree view area, which means you can check out from head to toes of those who are knocking on your door, so it can take good care of personal safety. The surface of door viewer covered by protecting layer, which can reduce contacting with air, resulting in better ability of rust proof.