Has anyone had any success removing a snapped one? Do any of you guys know what thread they are?

Thanks!

I didn't have any luck and snapped the first one I tried to remove. After that, I let the others soak in penetrating oil for a long time and heated them up a bit with a propane torch. I didn't have any problems with the others and had a spare caliper to replace the one I screwed up.

Before you do anything drastic, consider working around the damaged bleed nipple. I discovered a thread somewhere where others were bleeding using the banjo bolt after they broke the bleed nipple. If you really want to get that thing out and haven't dealt with snapped bolts before, check Youtube videos for general advice. Maybe someone else here has more specific help.