TEKTON 4929 3/8-Inch Drive by 7/8-Inch Oxygen Sensor Socket Removes and installs oxygen sensors on vehicles with computer-controlled engines Common 6 point, 7/8 in. (22mm) socket fits most oxygen sensors Side cutout prevents damage to wires Constructed from drop forged, heat treated, chrome vanadium steel High-contrast, permanent, laser etched size marking is easy-to-read, even in low light