Paul, those files are an interesting mix. Most are at least stamped rather than black ink, but as we have learnt from our Austrian TF (Toledo) experience that is no guarantee of good quality.
However, the grinding of the blanks appears to be of Indian Standard (look at the untoothed shoulders). Rubbish grinding more or less makes the single cut files into a double cut for smoothness of finish, but the worst aspect id when a deep groove is near the edge it creates a fracture point for the corners to chip off. Combine that with incorrect tempering resulting in brittle steel, and the manufacturers should start issuing warnings to wear safety eye glasses.
Some readers at least will remember my sig pic for the last 5 years.
https://www.woodworkforums.com/attach...5&d=1371777061
This is what I would regard as a well ground blank:
https://www.woodworkforums.com/attach...8&d=1371712375
This is rubbish:
https://www.woodworkforums.com/attach...1&d=1371712380
and this one shows exactly how crap grinding makes it a double cut - look at the teeth:
https://www.woodworkforums.com/attach...4&d=1371712389
I mean, it's not like grinding a blank is that hard to do - just change the grit of the linisher belt (or whatever they use) to something a bit finer.....