THIS IS A LEITECH THREAD/DEPTH PLUG GAGE, MODEL M14 X 1.5 - 6H, MANUFACTURED BY LEITECH-US. THIS GAUGING TOOL IS SPECIFIED AS A GO/NO GO TYPE. THE THREAD SIZE IS M14 X 1.5, WITH A CLASSIFICATION OF 6H. THE TECHNICAL SPECIFICATIONS INDICATE A GO PITCH DIAMETER OF 15.026MM AND A NO GO PITCH DIAMETER OF 15.216MM.