The NOx/Soot Sensor Thread Chaser M22x1.5, No. 9361, from CTA Tools is used for cleaning threads in NOx/soot sensor holes in both light and heavy duty diesel engines, including diesel particulate filters and various exhaust sensors. Safely cleans threads without damaging exhaust systems, providing a dependable solution for maintaining and repair NOx/soot sensors. Features a 1/2" hex head for convenient use with ratchet wrench, for easy clearance. Designed for nitrogen oxide sensors with M22x1.5 threads for effective and precise cleaning. Crafted from GC15 material with a hardness rating of 53-58HRC.