Tapered Electric Guitar Nut File Set, 3 files
I have these and they are good. 10-46
But if your slots end up deep (the file is V shaped) and it will look like it is too wide.
I think they are cut a little wide and will try going one size down , especially for 09-42.
I think you can effectively do at least 10-46, 09-42, 11-52 with them by choosing carefully but I cant say with certainty.
I have a set of the $10 PRC ebay offerings and mine are awful, the sizes dont really match up.
Ok for utility file as needed, but not as nut file.
The individual ones that look like hacksaw blades are possibly the best, but pricey.