Description: Made of zinc alloy, ensuring quality and durability Optical lens with 200-degree visual angel offers a crystal clear view with an extraordinary wide angle coverage. Heavy duty privacy cover design can prevent outside people peeping through the viewer, offering you the hightest level of pricacy of your protection and safety. Pipe diameter is adjuastable and peephole is easy to install. Suitable for within 50-90mm/1.97-3.54 inch thick. Specification: Material: Zinc Alloy Viewing Angle: 200 Top Diameter: Approx. 31mm/1.22inch Botton Diameter: Approx. 20mm/0.79inch Pipe Diameter: Approx. 16mm/0.63inch Total Length: Approx. 63mm/2.48inch Inner Height: Approx. 55mm/2.17inch Application: 50-90mm/1.97-3.54 inch thick. Package Includes: 1 Piece Peephole Note: Select the appropriate size of peephole according to the actual size of the hole on the door. Only need two sizes: hole diameter + door thickness. If you want to prevent your door from being unscrewed by outside people, please put some tape on the screw-thread of the door . Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color tone of the pictures and the actual item.