Grobet Swiss Precision Jewelry Files are manufactured to precise production standards, using a combination of machine cutting and hand craftsmanship to produce the most accurate, best cutting and longest-lasting files in the world. Grobet Swiss Precision Files deliver superior performance on all metals. Simply the best you can buy. Grobet Swiss Precision Files are measured in length from the point where the teeth begin to the end of the file. The handle section (tang) is not considered in the file length. The world's standard for quality and performance!