what are "female reducers" used for?

This part was in a catalog of rigid conduit fittings. It is just like a reducing bushing, threaded inside and out, but it also has a "hex nut" flange one one end so it can be turned with a wrench. What are these normally used for? Another clue-- the part is a Thomas & Betts 1250. Could this be used to enter a box that has a knockout that's a size too big?
--zeb
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snipped-for-privacy@hotmail.com wrote:

If this is what you're talking about,
http://www.tnb.com/ps/fulltilt/index.cgi?part 50TB
You would use it to attach 1/2" conduit or a fitting to a cast "Malleable Iron" box or condulet that has 3/4" threaded hole. You would screw the 3/4" part into the box or condulet using the hex flange to tighten it with a wrench. You would then screw your 1/2" conduit or fitting into internal part of the adapter.
TDD
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