This file works great.
This is the 2nd nail file I have bought. I have used this 2 times so far for my in home dip powder manicures and I LOVE this one in comparison to my other.  The handle fits so comfortably in my hand which makes it so easy to maintain control and feels like it will last forever, not cheap plastic.  The drill attachments are easy to insert and remove.  I like the fact that this package also comes with the extra sanding bands.  I was also able to use drill bits from another set with no problem.  The pen has adjustable speeds and rotation, with the control being on the plug wire.  I honestly didn't notice a large difference in the speeds that were available.  My only complaint would be that I wish the controls were on the actual pen.  Also, the cord is short and the pen has to be plugged in for use.
Rating: 5 stars