Feature: 1. Widely Used: The door viewer is suitable for 15‑25mm/0.6‑2.0in door thickness, suitable for wood, fiberglass or metal doors, with a wide range of applications. 2. Simple Installation: Easy to install, the copper door viewer can be replaced within 5 minutes without tools, which brings you a lot of convenience. 3. Safety Protection: This safety door viewer can protect your home from burglary, intrusion and home invasion, giving your family extra safety protection. 4. Easily Recognize: You can recognize the safety of visitors from behind the locked door, and you can easily view the people standing outside, from the top of the head to the heel. 5. High Performance: The length of the viewer can be adjusted appropriately, anti twist, anti skid and pry proof. The inner wall has fine butt threaded threads, which is safe, and can effectively prevent thieves from using tools to pry and damage the viewer. Specification: Item Type: Door Viewer Material: Pure Copper Product Color: Steel Color Length: Approx. 3cm / 1.2in Applicable Hole Diameter: 14-20mm / 0.6-0.8in Applicable Door Thickness: 15-25mm / 0.6-2.0in Product Weight: Approx. 29g / 1.0oz Installation Method: Surface mounted, opening hole. Package List: 1 x Door Viewer