Three problems. 1) Ring nuts are covered in some kind of cheap coating that will scratch/flake off the first time you put the head on. 2) There is so much coating in them that half of them won't scroll more than a few turns. Those who do will take your strings. 3) THE BIGGEST problem. they're not even done yet. What is the purpose of selling an open ended nut that is not fully threaded to let a bolt through? I recently installed extended ARP motorsport studs and each of these open ended nuts sticks out on the inside before they get down far enough to hold the wheel. Cheap junk!