TOGU TG1612-3016NG-SN Brass UL Listed 220-degree Door Viewer for 1-3/8" to 2-1/6" Doors, Satin Nickel Finish 1. High quality optical lens with 220-degree visual angel offers a crystal clear view with an extraordinary wide angle coverage. You can easily view the entire surrounding area from the top of the head to the feet of someone standing outside. It offers the highest quality security for you and your family. 2. Durable Solid Brass metal with super simple installation. Suitable for 1-3/8" to 2-1/6" thick doors, simply drill a suitably positioned 5/8"(16mm) diameter hole, insert the viewer into the hole then screw the two sides together and tighten by hand. 3. Togu door viewer surface treatment passes 72-hour salted-spray test, while the industrial standard is passing 24-hour test.The special 5 times electroplating coating for surface treatment makes the finish colorfast and extraordinary corrosion resistance. 4. Fast Delivery with FIVE YEAR REPLACEMENT WARRANTY, if you are not 100% satisfied with this Door Viewer, we will replace it with a brand new one for you for a period of up to 5 years! 5.This top quality door viewer is currently on a special promotion, giving you security and privacy at a great value price!