SPELAB O2 Oxygen Sensor Bung M18x1.5 Copper Material: brass Angle: 90 Degree Weight: 140g/0.3 pounds Copper Made. As far as I know, ALL O2 sensors are the same thread that fits all M18x1.5mm threaded oxygen sensors. FITS MOST STANDARD CAR OXYGEN SENSORS: All the thread size of the oxygen sensor extender is M18x1.5mm, so the oxygen adapter is applicable to most modern vehicle cars and easily screwed into upstream and downstream o2 sensor and car exhaust, and fits most car’s O2 sensor threaded socket or tool. RIGID STEEL CONSTRUCTION: Each bung o2 sensor is constructed of mild steel to avoid cracking and excessive heat expansion. After each o2 oxygen sensor spacer is manufactured it is coated in a durable corrosion-resistant plating an polished to a mirror finish.