In the old days (mid 70's) they called that a "Pistol Pac".
I had a buddy that had one in .357 magnum. Had the 4 barrels, the frame/cylinder, the wrenches, the different front sight blades/colors, the allen wrench for those, different grips, the allen wrench for those, the feeler ga. for setting up the barrel/cylinder gap, etc, etc.
Nice, accurate revolvers.