this O2 sensor tool is really great because it is thicker than most and the hex goes all the way through so you can use either side. Plus you can use it as a crows foot or a regular wrench. Much better than MAC or Snap On.
Finally, an Oxygen Sensor socket that works! This one is as good as a 6 point deep well socket but you don't have to destroy the sensor to use it. Hook up your 1/2" drive breaker bar and pop it out. Socket holds it shape under torque.
I was fighting an O2 sensor that was in a very difficult position and seated in with age. Nothing I tried prior to this wrench would budge the sensor - even with liberal doses of PB Blaster. I thought this wrench would allow me to put an impact wrench to it, but just being able to put a breaker bar in the tool did the trick and the sensor came right out.