They are true studs. They have splines to keep them from spinning. I was able to punch out two of the three. However, the third one i straight up had to drill out. Start with a small bit and work your way up.That's the plan. Having a hell of time getting the bolts out though. Can anyone who has removed them tell if there are threaded into either of the flanges or is it smooth through flanges until exposed threads for nut?