We would like to inquire about the Spark Plug following are the specs,Beru 14R-4 CIUHigh-quality electrode material allows a reliable ignition and long service life.Roof electrodegap: 0,30 mmelectrode material: IridiumThread size: M14x1.25 Thread reach: 19 mm (3/4'')Hex size: 20,8 mmApplication: Deutz MWM, MAN and Caterpillar engines