The holes are spaced exactly to the size of a common plug, if the user has any oversized plug he won't be able to use all of the holes . That being said he has the option to us the diff holes in any configuration he pleases. I also love the recessed idea, I did think of it a while ago, would give it an extra clean authentic look . Only prob is imagine trying to grab a Frag of zoas when the plug sits completely flush with the rack. A torch would be no prob cause u have something to grab onto , but all soft coral would be an issue .
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