Arrived earlier than expected and got the job done. I used it to clean the threads on the pre-catalyst oxygen sensor on a 2001 Toyota Sequoia. The old sensor has frozen in the exhaust pipe. Its removal damaged the threads on the tube. Tried to put in a new sensor and damaged the threads on the new sensor. This die cleaned the threads on the sensor. Now you need to use the 18 x 1.5 tap to clean the threads on the exhaust pipe.