High-resolution vision: The door viewer is made of 4 layers of HD optical glass. You can see the 220-degree wide-angle scene outside the door through the viewer. The lens is hardly fogged or damaged. Well-built structure: Black door viewer is made of high-quality solid steel and stainless steel, which provides higher anti-rust performance and durability compared to those made of semi-metal. Better privacy protection: There is a peephole cover on the door viewer to protect your privacy and security, preventing anyone from peeking outside the door when you keep it as your front door viewer, avoiding privacy leakage and theft accidents as much as possible. Hassle-free installation: The front door viewer comes with a matching drill bit (16 mm), which is compatible with door thickness from 35 mm to 55 mm. Even if you are not good at manual work, you can easily complete the installation in 30 minutes. Color: Black Material: steel Size: Suitable for door width 3.5-6 cm Package contents: 1x Viewer 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 allowed measurement error is +/- 1-3 cm.