The FLEXHEAD O2 Flexible Head 22mm Oxygen Sensor Wrench is a high-quality, single item hand tool designed to save time and money with every use. Made in the United States, this open-end wrench features a flexible head that allows for easier access to tight spaces, making it ideal for automotive repairs and maintenance. The 22mm size ensures a perfect fit for most oxygen sensor nuts, providing a reliable and efficient solution for your wrenching needs. Fits 90% of oxygen sensors. Please view pictures for more details.