1. The structural design of the O2 sensor gasket is relatively simple. It can be directly installed with bolts without significant modification. 2. The thread specification of this product is M18x1.5mm. The oxygen sensor can be screwed into the gasket, and then the gasket can be screwed into the exhaust system. 3. It is made of highly polished metal, which is corrosion-resistant and relatively durable. 4. The product length is about 3.2 cm. 5. It is suitable for most standard oxygen sensors (many modern vehicles are equipped with oxygen sensors with M18x1.5mm threads). It is an important accessory for off - road vehicles installed with high - flow catalytic converters, sports exhaust pipes, downpipes or straight pipes. Product Name: O2 Sensor Gasket Material: Metal Thread Specification: M18 X 1.5 Features: Universal, Threaded, Easy to Install Size Details: Length: 3.2 cm / approximately 1.26 inches Precautions: - Due to differences in light and screen settings, the color of the product may vary somewhat from the picture. - Due to different manual measurement methods, slight differences in size are acceptable. Package Contents: 2 O2 sensor gaskets