Attaching
The fastener is an anchor, an expandable sleeve that slides into a hole drilled into the wall. A lip wider than the hole prevents it from falling behind the wall. A machine screw is then screwed into the sleeve, causing the anchor to bend, expand, spread and grip against the inside of the drywall.
Mollies come in various diameters and "grip lengths" for different drywall thicknesses and to support different loads.
Read more about this topic: Molly (fastener)
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