The LISLE TOOLS 12220 NOx Sensor Thread Chaser M20 is a specialized hand tool designed for automotive maintenance and repair. Manufactured by Lisle, this unit is specifically designed to detect and clean M20 threaded connections in NOx sensors, ensuring optimal performance and efficiency. With a unit quantity of 1, this tool is a valuable addition to any automotive tool collection, making it easier to maintain and troubleshoot vehicles with ease.