Graphite Electrode Master Thread Plug Gage setting the Working Ring Gage

Instructions:
1) Implementation of Standards: JIS R7202: 2008
2) Material； GCr15, Measuring surface hardness 60-63 HRC;
3) Comes with the calibration certificates.
How to order?
For example:
Please mark: 600T4N or 317T4N Ring&Plug , and Master Gages, 7 psc / sets.
and E-mail： sales@fyougauges.com