Performance Tool W84007 Flexible Head Oxygen Sensor Wrench with Contour Handle , Chrome-Vanadium Steel ( 7/8" or 22mm) Designed for all oxygen sensors with 7/8 inch(22 mm) hex Flex head offers needed clearance for removal or installation of oxygen sensors when it is positioned close to the floorboard or when leverage is needed around an exhaust pipe Ford Contours, 4.6L and 5.4L Ford modular engines, 7/8 inch and 22mm knock sensors used on mid-sized trucks, SUVs and vans Curved handle allows user to easily work around exhaust Made of chrome vanadium steel