31-5XX = Grobet Half Round Needle File 5-1/2"

GROBET SWISS PATTERN PRECISION NEEDLE FILES These are precision files made for exacting work. They are machined out of the highest quality steel and finished to precise shape, accuracy, and balance. The have round, knurled handles, but more comfortable handles can be added later. We stock the popular 5-1/2" (140mm) files in 0 (coarse), 2 (medium), and 4 (fine) cuts. The 5-1/2" needle files have a cutting surface of 2-1/2". You also might like to add file handles for comfort.