The Oxygen Sensor Thread Chaser from Duralast lets you clean and repair M18 – 1.5 metric threaded sensor ports and spark plug threads. It securely connects to any 3/8" drive extension, providing easy access to damaged threads and ensuring the hardened steel threads are correctly aligned for professional results every time. With a forged construction and corrosion-resistant finish, it’s a tool you can rely on for a lifetime.