I've been hunting for a new one of the cutters in the links below.
It's part of a bicycle bottom brackets facing tool, but it appears to be just a standard facing mill cutter. However I can't seem to find anything like it anywhere.
Inside bore is 16mm (possibly 5/8"), with overall diameter being 44mm. Outside diameter isn't majorly critical.I could get that one sharpened, but it would be nice to have a spare one. One from the original tool supplier is not really an option, as I'd be cheaper buying a new tool.