Flat file: used for filing flat, convex flat Half-round file: for filing concave surfaces, large round holes, small flats Square file: used for filing grooves and square holes Triangular file: used for filing the inner angle surface and groove greater than 60° Round file: used for filing round holes and small radius surfaces For grinding, polishing, engraving, cutting and filing glass, ceramic, metal, jade, stone, and cemented carbide. Diamond alloy files are made of diamond and substrate electroplating with fine grains, sharp, wear-resistant, high-strength and good wear resistance. Suitable for garages, factories, engineering, workshop and DIY use.