This socket's slotted design allows you to remove oxygen sensors with the wiring harness still attached. This oxygen sensor socket is also offset and compact which allows for extra leverage even in hard to reach spots. For removing and installing 7/8" 22mm O2 Oxygen Sensors Constructed of chrome molybdenum steel Offset design for added working depth Works with any 3/8" drive tool 6-point beveled nose design securely grips sensor fasteners, preventing damage to the sensor Wire gate allows you to easily slip the socket onto the sensor, preventing damage to the wires Common 6 point, 78 in 22mm socket, suitable for most oxygen sensors. Use with any 38 inch drive ratchet or breaker bar. Its very handy. The socket is slotted so that you can remove the oxygen sensor while still connected to the wiring harness, and the socket is offset and compact, providing additional leverage even in hardtoreach spots. This quality tool can save your knuckles and time This socket made from premium Chrome Molybdenum steel, the socket allows users to exert maximum torque while the precision casting ensures accurate fit and function. Even if you dont have a lot of experience working with cars, you can replace your O2 sensor with this tool to help with your cars emissions and gas mileage. The sensors live in the harshest of environments and may require some elbow grease to remove, but this quality tool can save your knuckles and save you time Thank you