File 180 / Buffer 200: This is a combination file/buffer ideal to keep at home. The file side has a medium grit and is used to shape and refine the contour of the natural nail. It is also used for smoothing out rough edges and removing any excess material left from shaping. The Buffer 200 has a very fine grit and is used  to smooth out any imperfections on the nail surface and create a polished finish.