Specification:*O2 Oxygen Sensor Bung+Plug Kit*Designed to adding a O2 sensor in any place you need*Great for custom exhaust installation, headers, down pipes, etc*Easy to weld on*Material: Iron*Thread: M18x1.5mm*Size: standard M18 X 1.5 thread (both bung and plug)Package Includes: 1 x O2 Oxygen Sensor Bung 1 x O2 Oxygen Sensor PlugNote:Please allow 1-10mm difference due to manual measurement. Due to light and screen difference, the item's color may be slightly different from the pictures.