WOW! Stack up to three! Reminds me of multiple Allison P-51 Mustang engines powering a pulling tractor! At what point does the stud fail and break off? At little pricey ... just under $700.
"Use singly or stack up to three X4s. Stacking multiplies, not adds, torque ratios—resulting torque can be considerable. Only the torque ratio changes; total capacity is equal to and does not exceed the capacity of the largest wrench in the stack."
"resulting torque can be considerable" is probably an understatement!
GA190, Torque Multiplier, X4, Geared Head, Bar Reaction, 2000 ft. lb. Output
Does it come with a handle? The drawing appears to be only the head. How long is the handle? Hollow or solid.
If you can afford it, another thing you shouldn't leave home without!