Many times harder than conventional filescuts 10x faster and in all directionscuts into welds and hardened surfaces where other files can’tsmooth action10″ overall length with 8″ bladethe diamond file set includes the best contoured files available on the market today. these four abrasive, diamond-coated files (half round, round, flat and square) are harder than traditionalfiles, and can be used in any direction, cutting faster andsmoother for a better finish.