It appears this is a Snap-on exclusive die stock (double hex), not available through any other channel.
Oh, I never picked up on that being exclusive. When you think about it with only 2 handles you are pushing one side north and the other south. I wonder if this design actually distributes the force equally around the die. Specially on larger dies with 4 and 5 starts on them it would be ideal if all starts had equal pressure.
I had to tap some metric threads a while back and I only had a cheap set in metric. I broke one handle on the die stock 1st off so welded in back on then the other side broke so I welded it back on then the die broke. I went looking for a western made die and came home with a MAC branded Irwin kit. The 1st thing I noticed was how nice the die stock felt. The next thing is how nicely the die cut the threads I'd been struggling with the night before.