This file is for crowning jumbo frets but can be also used to dress your sharp frets any size. There is a thomann video on youtube that goes through how to dress your frets and they show this file and how to use it properly. So the video is a must watch for someone who is just getting started. The file is sharp so no need to press it like crazy against the frets, less is more.
All in all this file is priced fair (compared to other fret files), that cheap fret set is nothing compared to this and using this file you can crown and dress frets no problem.
Highly recommend this product.