2 1/2 inch-8 NPSM 2B Go & NoGo Assembly with handle complete with cert of Accuracy NIST traceable tool steel RC60-62 Handles can be marked with up to 15 characters at no additional charge. A full long form certification of calibration can be provided at additional cost if requested. Add $25.00 per plug end . Certificate of Accuracy is included.Click HERE to read about additional Long Form Cert.