I would imagine it's the same as the Yard's 154CM.
See my avatar?Mud Puppy hammered into a 1/8" walled 2" steel tubing with no damage.Did it point first through the side also with no damage.
Plenty hard.
I even hammered it through a Boss Street edge to edge.
The BS broke in half & the Muppy suffered a big chip.
Boss Street-unusable,Muppy-reground & still going strong.
Plenty hard.
Gotta get me a Harry Carry some day.
Wow, that is quite a workout you gave that Mud Puppy!