Teaching the art of metal finish for years, I have used just
about every file made...Many say that the sheet metal used today
in the production of new cars cannot be metal finished because of
its thin gage which is completely false...to get the thin metal
straight, You must use a crooked file...sounds funny, but I guarantee its true...when You push a file, You actually are causing
a belly in the thin metal, whereas the file had a curve to it would
go down into the sunken metal to true it up...Our prototype hoods
were metal finished prior to installing the inner support structure. I would guess I would have 20 or more of those files...Sorry about being longwinded, but I thought some would like to know what such a tool is used for.....Bill B