They are great to sanding the edge off of glass in hard to reach places. Perfect for finishing the inside of cut bottles. Keep wet while sanding glass.
These Diamond Coated Half Round Files are used for filing the rough glass edges of rounded objects (like cut wine and beer bottles).
Stan Hockey (verified owner) –
This is the first set of diamond files I have ever purchased so I have nothing to compare them to. All I can say is that they work really well in filing details in glass.