Supply Of K-thread Profile Gauge Plug Type- Go & No Go With Wear Limit- 1.0 Mm Size- 55.635 Mm X 6.35mm For K-thread- Trunnion- Left Side. Ref Drg No. Rdso-sk 99002 Material- Tool Steel To Is: 3748/90. Hardness- 50/55 Hrc. Supply With Calibration Certificate- Valid For Year Issued From Nabl Approved Lab..