Flexbar Hardness Testing Files.Easy To Use, Portable Rockwell Hardness Testing System for Use in All Metalworking Facilities. Flexbar introduces a unique new Set of six Specially shaped files, each With a non-slip grip, color-coded Handle. The Rockwell value is printed on each Handle and the files Range from HRc 40 through HRc 65. Flexbar Precision Testing files have Specially curved Tips which Can reach into internal slots, Grooves and bores which Cannot otherwise be Tested using conventional Types of fixed or Portable Hardness Testers. They Can be taken to out-of-factory sites to Test for Hardness on Large structures or segments of Machinery. For example Large surface-Hardened gears, Large printing Cylinders or weld zones of heat affected pipe lines which Cannot be moved to a stationary Tester. Model No. 18750, Flexbar Hardness Testing File Set. Includes Deluxe fitted Case complete With instructions and conversion chart Rockwell C to Vickers.