After seeing little peepholes at your local hardware store I found this item at Revain. When I got the new viewer I knew I had made the right choice because it's bigger and has a wider field of view and a strong lens cap. Since I was installing on a metal door, I also purchased the correct size hole saw that was offered to the viewer. This made the installation very easy. I would also suggest putting a small bead of clear silicone around the outer flange to keep water out. Really no instructions with the viewer, but really self-explanatory. There is a DIY on You Tube if you need how to install it.
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