Ideal for INSTALLING a new O2 sensor; but, a little pain to remove the old one. This is a true 22mm jack. Using it to remove a stubborn 7/8" screw will result in the old screw getting stuck in the socket. To do this you need to crawl out from under the car, pull out the nut and go back to install a new sensor. DO NOT overtighten It is better to cut the wires and use a 22mm deep socket or 22mm wrench to remove.