Having never used one, early last year I went looking for auger bit files. At the time I ordered some saw files from CHT, but their auger bit files were either out-of-stock or discontinued (or something...). So I ordered some from three suppliers in the States:
top $US16.95 from Tools for Working Wood. Made in Italy;
middle $US8.50 from Lie-Nielsen. Made in India.
bottom $US11.20 (each) Magbit from Amazon. Made in India.
The file supplied by Lie-Nielsen and the Magbit files are almost certainly from the same manufacturer. They look alright, and if Lie-Nielsen sell them they must be alright. There is a safety warning on the Magbit containers "ALWAYS wear eye protection" and "DO NOT exceed 1200RPM" !!!!! :roll:
The Italian bit, on the other hand, is a work of art. The edges of the handle are rounded, and the file portions are tapered in thickness as well as width.
I don't use my augers very often so I've only sharpened one bit in the intervening months
. I used one of the Indian bits and it seemed okay. Certainly the safe edges were great for a learner like me.
Cheers, Vann.