1、Applicable door thickness: 35-60mm / 1.4-2.4in, suitable for wood, fiberglass or metal doors, can effectively protect your home from burglary and home invasion. 2、Easy to install, the door viewer can be replaced within 5 minutes without tools, providing the highest level of protection for your safety, convenient to use. 3、The 220-degree viewing angle provides the security of identifying visitors from behind the locked door, you can easily see who is standing outside, practical. 4、The lens is composed of convex lens, focusing tube, concave lens, concave lens, washer, convex lens and metal frame, durable in use and has a long service life. 5、Precise thread, the length can be adjusted properly, anti-twisting, anti-skid and anti-prying, effectively prevent thieves from prying and destroying door viewer. 6、A sturdy viewer cover increases your safety, after cover the cover, visitors outside cannot see through the viewer into your home, protecting your safety. Condition: 100% Brand New Item Type: Door Viewer Material: Zinc Alloy Length: Approx. 4.5cm / 1.8in Applicable Door Thickness: 35-60mm / 1.4-2.4in Installation: Surface mounted, opening hole Type: 16mm Silver, 14mm Gold, 16mm Gold, 14mm Brushed Color, 16mm Brushed Color (optional) 16mm Silver 16-19mm Hole Diameter Suitable Opening: 16mm / 0.63in Diameter 14mm Gold 14-16mm Hole Diameter Suitable Opening: 14mm / 0.55in Diameter 16mm Gold 16-19mm Hole Diameter Suitable Opening: 16mm / 0.63in Diameter 14mm Brushed Color Suitable Opening: 14mm / 0.55in Diameter 16mm Brushed Color Suitable Opening: 16mm / 0.6in Diameter Weight: Approx. 65g / 2.3oz 2 x Door Viewer