HIGH QUALITYMade of high-quality zinc alloy, with electroplating process, anti-corrosion, more sturdy and durable. Adopt high-tech optical glass lens to provide a clearer vision. 200 DEGREESBeautiful 200 degree viewing angle provides confidence in identifying visitors behind locked doors. Lenses protect your home from theft and intrusion. Back CoverThe peephole has a cover that covers the lens by manually rotating the cover. It keeps others from prying on your door and keeps your home safe. Easy to InstallSuitable for 35-60mm thick doors, just drill a hole in the proper location, insert the sight glass into the hole, screw the two sides together and tighten by hand. No tools required, 5 minutes to replace the peep hole. Widely usedExquisite workmanship, suitable for doors, wooden doors, iron doors, bedroom doors.