Socket head fits and easily removes and installs 7/8” (22mm) O2 sensors on both sides. Type: Oxygen Sensor Wrench. 1x 6 Point & 12 Point Oxygen Sensor Wrench. 10" angled handle for easy Entering a confined space; 6 point side for stubborn sensors; 12 o'clock side of the socket head allows the wrench to engage recessed sensors with limited clearance at more angles.