A wall plug (UK English),[notes 1] also known as an anchor (US) or "Rawlplug" (UK), is a fibre or plastic (originally wood) insert used to enable ...
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the attachment of a screw in material that is porous or brittle or that would otherwise not support the weight of the object attached with the screw. It is a type of anchor that, for example, allows screws to be fitted into masonry walls. In US English, mentions of drywall anchors are sometimes meant (and taken) to refer specifically to the type of plastic wall plugs with expandable wings for hollow walls, in contradistinction with mollies and toggle bolts.
