Description: This high technology optical glass door viewer provides a 220 degree wider angle and super clear view out of the door. A good home security system help to effectively avoid home invasion or unexpected visitor. Replace the old one to reduce the potential danger of yourself and your families, especially child and the elder. Features: Made of high quality copper material with plating process, corrosion resistant, more solid and durable. Adopts high technology optical glass lenses to ensure clearer view. 220 degree wider angle than the conventional door viewer. With a lid of 1.5mm thickness, cover the lenses by manually rotating the lid to well protect your privacy. Fit for door thickness: 35mm to 60 mm, tube diameter: about 22mm, fit for hole diameter: 22mm to 25mm. Specifications: Condition: 100% Brand New Material: Copper + Optical Glass Color: Brushed Silver, Red Bronze, Bronze, Gold(Optional) Fit for thickness of door: approx. 35~60mm / 1.38~2.36inch Tube Diameter: 22mm / 0.87inch Fit for Hole Diameter: approx. 22mm~25mm / 0.87~0.98inch Angle: 220° Weight: approx. 82g Package Included: 1 x Door Viewer How to Measure: Please take part the old door viewer at first and measure the size of hole; if there is no door viewer, please measure the thickness of door. How to Install: 1. Depart the door viewer into 2 parts. 2. Insert the lenses from the outside of door. 3. Insert the base from the inside. 4. Tighten slot by hands or with the help of screwdriver. Note: 1. Please allow 0-2cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.