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Modern resin mixtures are based on [[polyester resin]]s. Apart from their use in construction, they're also used in [[Bolt (climbing)|climbing]].
==Hollow wallsSee also ==
There are special fasteners for hollow walls such as [[plasterboard]] partitions, which are not thick enough to take wall plugs. The fasteners have toggle arms, which either drop into place or expand within the cavity, and a fixing [[screw]] which is threaded through them.
==Expansion anchors==
{{See also|Anchor bolt#Wedge}}
[[File:Mechanical anchors.jpg|thumb|Mechanical anchors]]
These are often called "lead anchors" or "plastic anchors", and are used as follows:<ref>{{cite journal
| title = Hold It!
| journal = Popular Mechanics
| volume = 146
| issue = 3
| publisher = Hearst Magazines
| year = 1976
| pages = 120–122
| url = https://books.google.com/books?id=cuIDAAAAMBAJ&q=screw+anchor+drywall+plug+plastic+lead&pg=PA120
}}</ref>
#Drill a hole the same size as the anchor body.
#Push the anchor to its full depth in the hole.
#Insert the screw through the item being fastened and screw it into the anchor tightly.
==Other types==
Anchors designed especially for fastening to hollow walls, include [[toggle bolt]]s and [[molly bolt]]s.
These wall anchors are also known by other names, such as, "tacos", drywall hangers, expansion nuts, etc.
== See also ==
* [[Well nut]]
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