Description: Material: This door viewer is made of durable zinc alloy, ensuring long term use and resistance to wear and tear.Clear Vision: The high-definition glass lens provides a 200-degree wide angle view, allowing you to see outside clearly without opening the door for enhanced security.Anti-Theft Design: The anti-pry and anti-twist features make this door viewer an excellent choice for enhancing your home or hotel's security.Easy Installation: Suitable for doors with a thickness of 40-65mm and a tube diameter of 16mm, it can be easily installed without professional help.Function: You can easily view the entire surrounding area from the top of the head to the feet of someone standing outside.With the cover in place, visitors outside cannot see through the viewer into your home. Specification: Material:Zinc Alloy Size Chart: Pipe Diameter: 16mm/0.63inch Package Includes: 1 Piece220 Degree Door Viewer Note: Please allow slightly errors due to manual measurement and different monitors.