NON-UPSET (N.U.E) Tubing Thread Gauges

1） Implementation of standards：API SPEC 5B：2008；
2) Material: GCr15， Measuring surface hardness 60-63HRC;
3) API thread gauge paired standoff deviation: S, S1 = ± 0.635mm;
4）The standoff delivery order: the master gauge - The Working Gauge - Product thread.
5) Comes with the fully parametric calibration certificates traceable.
How to order? 
For example:
Pls mark  :  Working Gauges: 2 3/8 TBG RING&Plug , or 2 3/8 TBG BOX&PIN, 
and E-mail to: Edwin@szfyou.com