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  • I want to drill a 20mm hole in some thinnish ply (12 or 18mm from memory).

    What would be the best type of hole saw?

    I also think I might want to drill a similar hole in some metal later, so was considering this bi-metal hole saw

    I have a normal decent hand drill.

    Cheers.

  • A hole saw should be fine. It'll help if you can rest the ply against a sacrificial bit of wood/MDF/whatever to support it while you drill the hole.

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