Offering both a round and a flat surface, the Norton India AO Half Round File, is made for imparting a fine finish on precision machine parts, tools and dies. Featuring an aluminum oxide abrasive, these files are designed to produce keen edges and uniform finishes while retaining their shape. For repairing edges, choose the coarse grit; for sharpening most tool edges, choose the medium grit; and for producing the sharpest edges, choose the fine grit.