What would you use a "rawlplug" for?

Answer Secure a screw in porous or brittle material

Rawlplugs, otherwise known as "wall plugs" or "anchors", are small plastic inserts that you insert into porous or brittle material in the place in which you also want to insert a screw. Once you drive the screw in, the "wings" of the plug open up and secure the screw and whatever load you hope for the screw to bear.

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