Really easy to find these pre drilled in aluminum. Check Kreg, Rockler, Incra, Woodpecker etc. Turns out the following are pretty much in order of cost.
Get one with the twist lock insert. Easier to remove to change bits. Many brands still have tiny threaded bolts you have to remove to change bits from above. If you get one, go buy a small box of the tiny bolts because if you drop one, chances you'll never find it again.
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