6 1/4" 3 Square (Triangular) Needle File Cut 4 Grobet Swiss Precision is a file that is 3 Square (Triangular) in shape, tapers in width and thickness. Total length of the file (including the handle) is 6 1/4" (160mm), the actual cutting portion of the file is aproximately 3" (76 mm). Width of the file is 0.146" (3.70 mm), Cut 4.