Hand files are generally used in workshops, maintenance shops. Hand files have the same cross-sectional dimensions as the Flat File but is blunt in shape (no taper). Double cut, it has one safe (uncut) edge which permits filing one surface without damaging an adjoining one.
Mill files are suitable both as an engineering and a sharpening file. Mill files are the best choice for filing where a smooth finish is important. Also good for polishing and deburring work in lathes