New Lisle oxygen sensor socket.  This socket slides over oxygen sensor, has slotted end for wire to slide through.  Socket has 3/8" drive, and also has 7/8" external drive (for use with wrench), for use with all GM TPI/LT1/LS1 Oxygen Sensors on the following vehicles:

80-02 Firebird/Trans Am (all models)
80-02 Camaro (all models)
84-88 Fiero (all models)
80-14 Corvette (all models)