Review on 10Pc Titanium Coated Mini Diamond Needle File Set For Metal, Glass, Stone And Pet Dog Nail Grinding/Filing by Ryan Springer

Overall awesome value in my opinion, but some of the tips are slightly "off"I use them for models and miniatures and they work great, just be careful not to use too much pressure or to file any portion down too much, but the different shapes give you options to be able to get to any pieces that have flash or burrs, or filing off glue spots to get a better adhesion to re-glue, etc.I can't say how durable they are, or how much abuse they can take, or what metals they'll work on, because that's not how I use them, but for what I use them for, they are just fine.

Which is plastics, resin, pewter.