Barrette files are tapered in width and thickness, coming to a rounded point at the end. Only the flat side of a barrette file is cut, leaving a safe edge and top. Measurements given are at the thickest point of the file.
Things you should know about ordering hand files:
Glardon-Vallorbe Swiss Made Precision Files are measured from the point where the teeth begin to the end of the file. A 6" precision file will measure 8-1/2" long from tip to end of tang, but it is called a 6" file.
Glardon-Vallorbe Swiss Made Precision Files are graded with a number from 00 for coarsest to 6 for finest. Remember, the higher the number the finer the cut.