This is a very solid door view viewer, but it was a bit too big for the hole that is already in my door. The glass in my peephole was cracked so I had to replace it, which is easy enough if a large pipe fits the hole. If it was 1/16 inch smaller it would fit perfectly. I live in the US and we use 1/16 inch spacing on our gear and I think that might be an issue.
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