I like these best of all the nut slotting files I’ve tried. The bottoms of the slots come out truly rounded. I have a set of similar slotting files, purchased from StewMac about 20 years ago, and the current files are an improvement - they are definitely rounder - closer to a half circle than the old ones.
The one difficulty I’ve had with these is that when the very thin files get down to a certain depth, the file starts to get hung up in the nut material – the same way a saw might get hung up in wood when you get too deep...but that’s not a problem with the file, per se. I may fix this by cutting the top of the nut lower before I deepen the slots.

I love my .010 gauge file! It's the best way to start my nut slotting especially for the treble strings.

If you do a lot of nut work then you need these files - accurate gauges and hard wearing - I use them in all my books Paul Balmer

Wrote a long review attesting to how awesome these are and couldn't do without them. Anyway it got erased when I went to correct some things. So get the file set, it's expensive but the guitars will be at another greater level.

I put off buying these forever. I finally got fed up with messing around with inferior methods and got these.One of the best things you can buy. My strings fit,and no more binding !

The best tools ever to make great guitar nuts.

Precise cut, but not the size range that suits my needs!

A must have for doing proper nut work!

Combined with string spacing rule these files give perfect result. I had some problems with 0.010" one the first time but turns out it was human error :)

I have the full set and they get a lot of use. They still cut like new. Take extra care using the 0.010" file though as it would be easy to break it if it should snag.