Nope, no hole in the center, and it's all metal.Well it looks to me like there is a hole in the center there; it also looks kind of white, like if its plastic... but it has to be metal to make electrical contact...

And all the airflow comes from these holes; there are three of them. The knurled ring screws down to expose the holes and up to cover them.

The finish on it is actually pretty good. The pics above were taken in extremely harsh lighting through a poor-man's macro lens and enhance every flaw tremendously.
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