If you have the Lorex home security cameras, with PoE, this will cap off the holes and fits the mounting hole template perfectly.

There is also a little ethernet jack on the part so that you can plug in the dangling ethernet cable. That way, in case you change your mind later and want to put the security camera back, you can easily retrieve and pull out the cable. Otherwise you will need to push the cable into the wall/rafter and you'd have to fish it through the hole again.