What is this part called (metal box square insert)

Old 09-05-20, 11:18 AM
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What is this part called (metal box square insert)

I am trying to find a specific part I need but I don't know what it is called. I have a metal square box I am planning to use for a standard pull chain ceiling fixture. However since the metal box is square and the ceiling fixture is round, I need the metal insert piece that screws into the square box allowing a round fixture to be screwed in. What is that insert piece called? Thank you.
Old 09-05-20, 11:39 AM
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We call them mud rings. They go on a 4" square box when it gets installed in sheetrock.

<img src="https://cimg7.ibsrv.net/gimg/www.doityourselft.com-vbulletin/138x137/4mr_b7b9f5bc3490fa1295da9f42b1f6e0ad09f867cf.jpg" width="138" height="137"/>

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