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I have 20mm previously drilled holes in double thickness insulated plasterboard.

I think a toggle bolt will be the most appropriate, but I’m struggling to find something that will be appropriate given the thickness of the wall and the insulation.

Any recommendations welcome!

Edit: I’m hanging a 12.5kg mirror, but the large holes are already there.

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  • Can you give us an idea of what you're trying to hang and the weight?
    – JACK
    Commented Oct 11, 2020 at 18:03

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These toggler anchors will work for thin to very thick walls.

You do not say what the insulation is, The insulation may be a factor in getting them to toggle into place properly. I sometimes use a wire to push fiberglall insulation aside a little so they sit properly.

I have posted several answers about installing these anchors read a few for info and tip/tricks.

https://diy.stackexchange.com/search?q=user%3A56737+toggler

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use the nut of a toggle bolt but substitute threaded rod (or a longer machine screw) for the screw part.

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    Hi. Your answers keep popping up on the "Low Quality Posts" review queue. Would you mind capitalizing, and even add a second or third sentence? Thanks.
    – Daniel Griscom
    Commented Oct 12, 2020 at 11:03

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