Those are commonly called Nutting Stones and the premise is they were used to crack nuts in the holes. There are several other theories as well including the one you suggested.
Because of size and the way the cupulet looks I would guess fire starter. But as Reaper pointed out a lot of these are speculation now unless specifically found in a fall mast shelter. It is a very neat stone age artifact Amishboy .
Nog een prettige dag
TnMtns