Specifics:- Easy to install, replace your door viewer in 5 minutes with no tools required. - The lens will secure your home against burglary, intrusions and home invasion. - Naierdi brand   Suitable for door: 35-50mm Finish: Sliver / Gold Material:Zin Alloy + Optical Glass Fit Hole Size: 16mm diameter Degree:200   Package Include: 1 x peephole   About Jifu 1. 33 years of OEM and retail experience. 2. Over 8000 square meters of workspace. 3. Capacity 160PCS/month. 4. Certificate: UL&CE 5. All products QC staff check before Delivery. 6. Quick reply within 12 hours.