For the removal of any ski or boards sidewall. The most important tool to use before side-edge sharpening or polishing. Removing the sidewall allows the file to cut the edge & not be interfered by the skis or boards sidewall. This tool is crucial in order to side-edge file/polish effectively! Round cutters are typically used for 'cap' construction skis. This cutter also works extremely well on 'sandwich construction' type skis/boards & is a bit more universal than the square carbide cutter.