4 Prong Zinc plated M10 T nut.
These are hammered in to the back of your wall, so the bolt can go through the hold and 18mm of plywood, into the imbedded T nut.
They stay captive in the wood once they've been hammered in.
You need to drill a 13mm hole to fit these
Its always best to buy more than you need. Hammer them in before you put your wall up. Its easy to put them in before you build your wall, but hard to retro fit them if you don't have access to the back of your wall
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