what is tool called

what is this called and what part of the file does it go on?

what is this called and how many uses does it have

what is this called and what will a file that cuts faster cause

what is this called and whats its use

what is this called and what is the one thing it has that sets it apart from every other file

whats this called and what will a slow cut file cause

what is this called

what is this called

what is this called