Originally Posted by
sweeks
FWIW, I measured all 5 of my Park Tools cone wrenches; they are all 2.3 mm thick at the business end.
These are the black ones, and they seem quite hard.
The Park chrome (nickle only?) plated ones are 1.9mm.
The Hozan chrome ones are 2.3mm.
I did get two sets of thin-but-thicker spanners, metric and imperial, 3.4mm - they've been properly useful a few times.