Pferd Diamond Needle File Kit DF 4205 Diamond needle file sets are supplied in sturdy plastic wrap. 126 Grit Size Diamond needle files are designed for general use in tool making. Diamond needle files in extra slim design are particularly suitable for work on hard-to-reach contours. Diamond files are used successfully for tasks where conventional files fail down due to the hardness of the material to be worked on. Contents: 1 piece each: DF 4112 (Hand) DF 4132 (Three square) DF 4142 (Square) DF 4152 (Half-round) DF 4162 (Round) Recommendations for use: Apply only slight pressure to the file, especially in workpiece edge areas. Loaded diamond files can be cleaned in kerosene or anti-static plastic cleaner with a file brush. Alternatively, ultrasonic cleaning is also possible. Often it will suffice to knock the file against a hard object. Avoid contact with grease when using files!