The Performance Tool W84007 Flexible Head Oxygen Sensor Wrench is a versatile and efficient tool for any mechanic. With its universal fit for all oxygen sensors with a 7/8 inch (22mm) hex, this wrench can be used on a variety of engines, including Ford Contours, 4.6L and 5.4L Ford modular engines, and 7/8 inch and 22mm knock sensors used on mid-sized trucks, SUVs, and vans. The flex head design allows for needed clearance when working close to the floorboard or around an exhaust pipe, while the contour handle provides maximum comfort and control during operation. Made of durable chrome-vanadium steel, this wrench is built to last and withstand heavy use in any garage or auto shop.