This is a new very high quality and very correct pair of fly wheel bolts. These are the special bolts that fit into the crank of the early jeeps and attach the fly wheel to it. This is the late style that is not tapered and has the head on it. It is pretty obvious if yours crank shaft takes these. The threaded end is 1/2″ X 20 and 1/2″ long. The smooth shank that goes through the flywheel is 9/16 and 1/2″ long the head is 2/8″ tall.