Thingamabob for an electrical box -- what is it really called?

Metal electrical wall box, in wall with device i i.
Box is set too deep in wall, so that device wont screw tightly against box.
Aren't there some ort of "extnder" type things that can be screwedonto boxto extend depth of box?
Is there a technical term for these kinds of things?
TIA.
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jJim McLaughlin wrote:

STFW..
http://www.google.com/search?q=electrical+box+extender+&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
--

-G

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Box Extender or Box Extension
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'Plaster ring' or similar term; i.e. used to extend edges of metal wall box further out to match wall thickness?
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