Feature: 1, Easy to install, replace your door viewer in 5 minutes with no tools required. 2, The lens will secure your home against burglary, intrusions and home invasion. 3, Suitable for opening: diameter 16mm 4, Suitable for door thickness: 36mm-58mm   Description Material: Zinc alloy + Resin lenses Color : siliver , gold , copper Size : as pictures shows Weight :42g   Package : 1 x Peephole   Design Service Our team has experience in all fields relating to product design and development. if you have any needs for your new product of wish to make future improvement, we are here to offer our support. ·Packing design ·Improved product mix