1x 1/2'' Drive x 27mm (12 points) pressure sending unit socket; Ideal ForDesigned for the removal and installation of oxygen sensors, pressure sending units, and vacuum switches equipped with wires or vacuum tubes HighQualityOxygen Sensor Socket Set is made of High Strength CRV Steel and solid cast steel construction for strength and durability Finished with Black Oxide to prevent rust and corrosion How to UseUse one of the socket wrenches to turn and loosen the sensor, then clean the manifold threads with the thread chaser; Using the crowfoot socket to initially loosen the sensor as it generates more torque, then use the other socket once the sensor is free Package IncludedIncluding 78 Short low Profile O2 Oxygen Sensor Socket, 78 Universal Oxygen Sensor Socke 78 Universal Vacuum Switch PVS, TVS Socket Tool. Including 1, 116, 1316 Sending Unit Socket, 1116 GM Thermal Switch Socket Carrying CaseCome with a carrying case.Easy to carry and transport.