These studs are great! I had to modify the Crown Vic front hub for a cross member rebuild on a 65 F100. To run steel wheels with these hubs, you need THESE precision bolts and quality .75" aluminum spacers. I reamed the original bolt holes to .609" (39/64") which is within spec. Frost required. The landing was close. It was so tight that when I initially tried to pull the bolts in with the nut, the threads came loose from the nut when the bolt was only half installed. So don't do it. i made my mistake I was able to push them in, albeit nicely, without too much of a headache. Now I don't have to worry about the bolt turning in its hole when trying to install or remove lug nuts. These are quality cleats and worth every penny.