Love these drill bits they work perfectly!As annoying as it may be I had to exchange these as soon as I got them. The rod that went into my efile didn't fit. If this happens to you don't force it. You will break your machine. Just put in for an exchange. I did it once and the second one I got was just fine. And the product itself is amazing. I like these bits.Doesn’t fit my drill properlyI have a regular barrel bit (I don't know what the correct name is; I'm a DIYer) to file my nails after applying gel/polygel product and I find these ones, because of the shape, are easier to use. I usually cut myself with the regular one but have yet to do so with these. The after result looks so much more polished without bleeding cuticles. :)Super cute but they lose their sharpness much to soonGoodI like itIt is very well