Powerbuilt 648691 Oxygen Sensor Offset Puller Offset oxygen sensor socket provides extra leverage for easier removal even in hard to reach spots. Slotted design allows removing oxygen sensor with wiring harness attached Precision casting for strength and accurate fit. 7/8" (22mm) hex fits almost all oxygen sensors Slotted design allows removing oxygen sensor with wiring harness attached Offset oxygen sensor socket provides extra leverage for easier removal even in hard to reach spots Precision casting for strength and accurate fit 7/8 inch (22 millimeter) hex fits almost all oxygen sensors 3/8 inch square drive for use with ratchet