In my experience a good set comes with a case which is a big plus! And I got this set to make sure I have options to avoid "wrong". This is a set of 3 outlets of the same size but in different styles depending on the O2 sensor and/or outlet. I need to replace the oxygen sensor on my Mercury 5.0 boat. Of course it was the hardest of the four that went poorly. I couldn't have done it without this tool. Broke it with expected force but nothing crazy like broken bars etc. All in all a great purchase/tool to add to the arsenal.