I have played.  That is one beautiful set!  Put her in contortions that would be impossible, and nothing poking though or breaking down.  Super job!

Um, ya.  The handle refers to something not normally considered in the groups here, gaging tolerances.  I was, before retirement, a certified gage technician.  Retired from that and became a toolmaker. 

But definitely nothing rated triple X.

The "I" in Doric is Silent.