"These are the best plastic wallplugs I've found and the only ones which work as a cavity fixing. Just too expensive to use all the time but worth it for occasional use. Pity Screwfix don't sell them in smaller quantities."
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Review 5 for Fischer High Performance Universal Plugs UX10 6 - 8mm Pack of 50
"I've used these in a variety of applications, from fixing in through holes in thick steel plate, to more conventional blind holes in brick & block - they aren't cheap, but clever geometry means they grab and hold where other plugs won't."