Finger Nail File Question (Really!)

What is that curved out section of my finger nail file for? It’s on the side just about at the top of the file part.
(Yes I know a preposition is not a good thing to end a sentence.) With.

Thanks
(“Fingernail Jake”)

It creates a finer point at the end for digging under your nails.

It’s fine to end sentences with prepositions in modern American English in most cases.

For instance you can ask: Who did you go to the store with?
Sticklers might prefer: With whom did you go to the store? But that’s not necessary.

But its silly to say: Where are you at?

But others will still argue the preposition thing. Who are you gonna believe – your English teacher or a professional writer?