Features: brand new and high quality Fine thread design: can effectively prevent thieves from using tools to pry and damage the for cat's eye. Optical glass lens: The wide-angle field of view is clear and bright, with unobstructed views. Anti-peeping back cover: dustproof, prevent peeping from outside the door, and protect your privacy with care. Larger viewing range: 200° wide-angle, clear imaging and larger viewing range. Applicable door diameter: 16mm/0.63inch; applicable door thickness: 40-55mm/1.57-2.17inch. Specifications: Material: Zinc Alloy Suitable Door Diameter: 16mm/0.63inch Suitable for Door Thickness: 40-55mm/1.57-2.17inch Color: Black/Green Bronze/Gold/Red Bronze/Silver Degrees: 200° Wide Angle Size: As Shown Package Includes: 1x Peephole note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.