I purchased this file for my PG Zeta kit since it was my second PG and second most expensive kit that I've purchased (for now...) and I wanted it to look amazing and have no nub marks or uneven filing due to my old metal ones. This was one of the best tool purchases I have made in a long time! It works amazingly well and leaves the surface smooth and nub free. I have been dipping mine in a little water to help prevent dust from falling off the piece I'm working on and then to clean it when Im done I have just taken a piece of tape and it removes all the stuff that is stick to it! If your looking for a good started glass file I highly recommend this one as a starter!