Yeah... just a fine thread 1/2" grade 8 bolt. Glad to hear the threads in the dies hold up well. I was worried about long term effects of using an impact on them but not enough not to do it by hand. :G-Dub:

Thrust bearings are available to reduce underhead friction. If you can't get them from the die MFR, get them from a conduit punch MFR like Greenlee. They won't reduce wear on the threads, but will make manually turning the bolt easier.

They come with thrust bearings, I use an air ratchet, not the impact.