Originally Posted by CIM
If I was doing this sort of work often I would not hesitate to get a set of 'proper' nut files but as I only have to do so very occasionally I invested in what seems to be a reasonable set of files made from hard steel - much like slotted feeler gauges but the cutting edges are rounded (except in the thinnest ones) so in theory they should cut a good slot.
In practise I have found them to be fine - albeit slow. Is this a bad thing? Well not if you are inexperienced! For a Pro, its a waste of time, but for an amateur like me, it is far better to go slow and not cut a slot too deep through inexperience.
Are they inferior to proper nut files? Apart from being slow I don't know. I would not want to cut a metal nut with them but otherwise I don't see a problem.
Anyone know different?
To each their own. If you don't have the $46-$86 to spend on real nut files, and those wannabe "nut files" work for you, and yer havin fun, there's nothing else to be said except ... keep havin' fun.