2 PCS Security Door Cat Eye HD Glass Lens 200 Degrees Wide-Angle Anti-Tiny Hotel Door Eye, Specification: 16mm Red Bronze 1. Material: zinc alloy, high-definition optical glass 2. Suitable door diameter: about 1626mm 3. Suitable door thickness: 16mm is suitable for about 40-55mm, 26mm is suitable for about 46-76mm 4. Weight: about 30gpiece for 16mm, about 58gpiece for 26mm 5. Wide angle of view: about 200 degrees 6. Scope of application: home, hotel, apartment, etc. 7. Features: fine thread design, which can effectively prevent thieves from using tools to pry and damage the cat's eye, anti-peeping back cover, dust-proof and anti-peeping, large wide angle, clear imaging, and larger viewing range Installation Notes: 1. According to the measured size, select the appropriate specifications 2. Unscrew the cat's eye (Do not unscrew the outer cover, the outer cover is fixed with the lens) 3. Insert the front end of the cat's eye outside the door and tighten it 4. Insert the rear end of the cat's eye into the door and tighten it