My recommendation is to by a step drill and a file.
I bought a 10-30mm step drill, its perfect, fit's straight into your standard power drill. Just drill a small pilot hole for it to get started pop it in and away you go as if your just drilling a normal hole.
cleanest holes i've ever seen, file it down to perfection give it a bit of a sand and it's smooth as, or just get u-channel moulding or grommets etc.
Best $20 i ever spent. I never thought i'd be game enough to make my own holes.
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