Size This oxygen sensor socket is 78 inch 22 millimeter hex fits almost all oxygen sensors. 38 inch square drive for use with ratchet. DesignO2 Sensor Tool Standard 6 point with low profile and slotted design to enable you remove oxygen sensors with the wiring harness still attached, and the socket is offset and compact which allows extra leverage even in hard to reach spots. MaterialOur Oxygen Sensor Removal Tool is made from high performance chrome molybdenum and solid cast steel construction for strength and durability Finished with Black Oxide to prevent rust. USEThis oxygen Sensor Wrench is built for use with ratchets and breakers bars to remove and install oxygen sensors and hex vacuum switches on vehicle, even if you dont have a lot of experience working with cars. This high quality tool can save your time Service 100 satisfaction guarantee, If you have any issues with the 02 sensor socket, simply contact customer service for troubleshooting help, parts, replacement, or refund. Our aim is to make you satisfy the parts and the service we provide for you.