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  • There is a 22mm hole in this worktop which I need to be 26mm in order to pass a braided hose through- it feels like a ceramic, but is a thin layer on a chipboard backer.

    Can I use a step drill to take the existing hole out by a few mm, or is this a recipe for disaster?


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  • Try shaving a piece off the edge around the current hole with a box knife to see if it's plastic or ceramic, whether it crumbles or shaves. The current hole should give you an idea of how easy it is to cut anyway.

    The are hole drill shanks that allow you to put one size hole saw (in your case 22mm) inside a larger hole saw (26mm) so that the small one guides the larger one.

    Starrett make them :-

    https://www.starrett.co.uk/products/holesaw-accessories/accessories/smart-accessories/a19/

    If it is a ceramic material you should use a diamond hole saw. But it looks a bit like a worktop type I've fitted before which has a few mm of laminate on it instead of a fraction of a mm. It was popular because you could rout it to put a recessed sink under the worktop.

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