The NOx/Soot Sensor Thread Chaser M20x1.5, No. 9360, from CTA Tools is used for cleaning threads in sensor holes in both light and heavy duty diesel engines, including particulate filters and various exhaust sensors. Safely cleans threads without damaging exhaust systems, providing a dependable solution for maintaining and repairing NOx/soot sensors. Features a 1/2" hex head for convenient use with a hex ratchet wrench. Designed for nitrogen oxide sensors with M20x1.5 threads for effective and precise cleaning. Crafted from GC15 material with a hardness rating of 53-58HRC.