molly bolt

English

molly bolts:
top: as sold, ready for insertion;
bottom: partially expanded by turning the screw

Etymology

Former trademark.

Noun

molly bolt (plural molly bolts)

1. A specialized screw fastener used with drywall as a hollow-wall anchor.
   • 1960, John Updike, 'Rabbit, Run', page 85:

     Insecurely tilted against the wall is the big oval mirror they took away when her parents had a new bathroom put in; he always meant to attach it to the plaster above her bureau for her but never got around to buying molly bolts.

Further reading

• Molly (fastener) on Wikipedia.Wikipedia