If that's the case, the tool you're looking for is likely a nail file or emery board.
Here's why:
* Nail file: This is a tool with a rough surface used to smooth and shape nails. It comes in various grits (roughness levels) for different purposes.
* Emery board: This is a type of nail file made from emery paper, which is a type of sandpaper.
Let me know if you meant something else!