Material: Copper + Optical Glass Color: Silver Suitable for Door Thickness: Approx. 35~60mm/1.38~2.36inch Tube Diameter: 22mm/0.87inch Suitable for Hole Diameter: Approx. 22mm~25mm/0.87~0.98inch Angle: 200° Package Includes: 1 x Door Viewer How to Measure: Please take part of old door viewer at first and measure the hole size; if there is no door viewer, please measure the thickness of the door. How to Install: 1. Split the door viewer into 2 parts. 2. Insert the lenses from the outside of the door. 3. Insert the base from the inside. 4. Tighten the slot with your hands or with the help of a screwdriver. Note: 1. Please allow 0-2cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, so item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.