Some general advice - but it especially applies to reamers. Be careful buying some of the "round" products on Amazon (and probably others like Ali and Bangood) What some Chinese manufacturers call 1/4" I have found is really 6mm. They seem not to know there is a difference - or just think that close enough is OK.
Related thought - I just bought a few cheap machine reamers in metric sizes to expand my ability to enlarge a hole accurately. A 6.4mm reamer does a good job of opening up a 1/4" hole if you need a relaxed fit.