Valtitan Barrette Needle File Great For Metalsmiths, Metal Working & Filing. This is a new #0 cut Valtitan barrette needle file. This file can be used for filing flat surfaces, corners, keyways, dovetail ways, gear teeth and deburring. Has little or no clogging, a light knock is enough to loosen any clogging. Also has a Rockwell hardness of 72HRc. Highly resistant to corrosion. Made in Switzerland. It measures approximately 7 1/8" x 1/4" (180.8 x 6.5 mm).