features 220-degree wide viewing angle, one-way lock anti-theft and easy-to-use privacy cover, making it more practical for more occassions. Perfect home security tool! Features: Reiliable Quality: Made of high quality stainless steel and alloy, heavy duty, sturdy and durable. Red bronze polishing, classic color and elegant appearance. 220-Degree Viewing Angle: Clear optical glass lens provides a 220-degree wide viewing angle. It covers wide area for you to easily see anyone present outside from head to toe without opening the door. Anti-theft Design: Internal and external separated type can prevent the door viewer from being removed, one-way lock design to prevent theft effectively. Privacy Cover: Easy to rotate to open or close the privacy cover. Unlike other products, our door viewer has no extra back cover, which makes it more convenient to use. Easy Installation: Measure your door size firstly, our door viewer\'s pipe diameter is 15mm and is suitable for 15-28mm hole diamater. We offer you 2 types for option: suitable door thickness 40-70mm or 70-100mm. Note: Size and color may be slightly different because of manual measurement and different lighting conditions. Thank you for understanding.