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There is a "51mm" hole saw in my set. It is actually 2" as it is an imperial set. They weren't particularly cheap, but then no Sutton tools are.
Your local tool shop might also have metric ones if 2" isn't close enough.
You drill from one side most of the way through (until the pilot drill is all the way through), turn the timber over and finish from the other side. No surface splitting. 500rpm recommended max speed.
I'm sure you'd find other uses for the hole saws, like making wheels for toys, so you could amortise the cost.
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