High Definition Vision:The door viewer is composed of 4 layers of HD optical glass. You can see the 220 degrees wide angle scene outside the door through the peephole. The lens is hardly fogged and damaged. Well Built Structure: black door eye hole is made of high-quality solid steel and stainless steel, causing higher ability of rustproof and durability compared to those made of semimetal. Better Privacy Protection:There is a peephole cover on the door viewer to protect your privacy and safety,prevent someone from staring outside the door when you keep it as your front door peephole,avoid privacy leakage and theft accidents as much as possible. Hassle-Free Installation:The peephole for front door comes with matched drill bit ( 16 mm),which is compatible with door thickness from 1-3/8inch to 2-1/6inch(35mm-55mm). Even if you aren`t good at handy work,you can easily complete the installation in 30 mins. Colour:Black Material:steel Size:Suitable for door width 3.5-6 cm Package Contents: 1x peephole with back cover 1x drill bit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.