【Preium Lens Material】The required hole in your door is 1.1" / 28 mm, it is quite large. But the payoff is that it is very good at gathering and transmitting light. It is very clear through the glass optics (unlike cheap peepholes with plastic lenses, 【Simple Installation】This suitable for 1.65" to 2.16" ( 42mm - 55mm) thickness doors.Insert the viewer into the hole then screw the two sides together and tighten by hand. The viewing tube is somewhat larger than many other standard peephole viewer,, 【High Safety Performance】On this viewer, the plate rotates freely and has a quality feel to it, this privacy cover is great for stopping those with reverse peepholes from spying on you. Maybe you initially was going to buy the cheaper, smaller versio, 【200 Degree Visual Angle】Its material is solid brass,high quality door viewer and has a nice 220-degree visual angle. After installed it, you can view a person who standing outside from the top of the head to the feet, and you can easily view the ent, 【Home Security Essentials】Modern security door viewer and peep hole for doors. Perfect peephole for home, office, hotel and front door where you need to see, monitor, spy and peeking who is outside your door when the doorbell rings before opening, p
