Grobet USA 10cm Round Needle File, Cut 0. 100mm total length, cutting length 50mm, thinnest 0.5mm, thickest 2.2mm. Grobet USA Swiss Pattern Needle Files are precision files, for exacting work, especially under magnification. Made of the highest quality steel, machined and finished for precision shape, accuracy and balance. Handles are knurled. Overall length 4" (100 mm), Width 3/32" (2.2 mm)