bastard file

Butters had a voice like a bastard file skittering down a copper pipe.

Doggy leaps up on me and tries to wash my face with a tongue like a coarse bastard file.

It is a general purpose file that may be either single or double cut, with the most common flat file being the double-cut bastard file.

Garden tools like shovels and hoes have beveled edges that can be dressed with a bastard file - i.e., a flat file with medium-cut teeth.

Smooth files have 60 teeth per inch, second-cut files 36 teeth per inch and bastard files 26 teeth per inch.