Instructions say 28mm drill bit. This is absolutely wrong! The diameter of the bushing that fits the door is 5/8" instead of 28mm which is well over 1"! Use a 5/8" drill bit that is at least 2" deep to go through the door and install this peephole. It also has a HUGE hood that can be removed to reduce the external surface area. It's too big and looks like a giant fish eye.
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