I recall my father having a long round handled carborundum rod/hone. I remember seeing him use it to deburr a hole in a stainless steel sink for our kitchen. But he was an electrician by trade and may have acquired it for deburring electrical knock-outs. Maybe @plumberroy or another tradesman can tell us what that tool is called. I've often wished I had one.
Something like this.
https://www.nortonabrasives.com/en-us/crystolon-sharpening-steel
Yep, any ceramic rod will do but this one has a handle which I dig.