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Yep I certainly wouldnt use them for anything too structual!

I used a bunch this week to attach metal brackets and lintels to concrete and brick. So long as the concrete/brick is in good condition and not crumbly, gave a very good hold. I was using 6mm shaft ones at 50-100mm length and was able to drive them into the guide hole easily with my makita...

I use concrete screws that just need a guide hole drilled and are self tapping.