Diamancel products are hard as diamonds so they are very strong, washable and last for many years. They make diamond nail files, foot buffers and rasps (and also foot creams but I doubt they have diamonds in them!).
I use their nail file and like it so much I buy them as gifts. They are having a 3-day warehouse clearance sale this week.
Location: 4345 Poirier Blvd, Ville St-Laurent
corner: Thimens Blvd West
Dates and times : Nov 7: 11-7, Nov 8: 10-7, Nov 9: 9-4