Made of copper with plating process, corrosion resistant, more solid and durable. Adopts high-tech optical glass lenses for clearer vision. 200 DegreesA beautiful visual angle of 200 degrees ensures the safety of identifying visitors behind a locked door. The lens will protect your home from burglary and home invasion. Back Cover The viewer has a 1.5mm thick cover, cover the lenses by rotating it manually to protect your privacy. Simple installation Suitable for doors from 36mm to 60mm thickness, tube diameter about 16mm: just drill a 16mm diameter hole, insert the viewer into the hole, screw the two sides together and tighten by hand. without tools required. Widely useDelicate treatment, suitable for doors, wooden doors, iron doors, bedroom doors. Made of copper with plating process, anti-corrosion, stronger and more durable. Uses optical glass lenses to ensure a clearer view A beautiful 200 degree viewing angle ensures visitors can be identified behind a locked door. The lens protects your home against break-ins and invasions The viewer has a 1.5mm thick cover. You can cover the lenses by manually rotating the cover to protect your privacy well. Otherwise, other people can peep through your door to keep your home safe Specifications: Material: copper and optical glass Color: bronze Suitable for door thickness: about 35 - 60mm / 1.38 - 2.36in Pipe diameter: 16mm Suitable for hole diameter: about 16mm; Angle: 200 Scope of delivery: 1 x door indicator How to measure: Please take the old peephole and measure the size of the hole. If there is no peephole, please measure the thickness of the door. How to install: 1. Come out of the peephole in two parts. 2. Insert the lenses from outside the door. 3. Insert the base from the inside. 4. Tighten the slot by hand or with a screwdriver. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.