Please note, both of these hubs have a couple of loose studs. They have been on my 3.0 Six conversion for years this way, but upgrading to 911 parts, no longer need these. The lugs tighten up, and torque fine, have never caused me a problem, car has seen multiple track days without issue. Trust me I show the car NO mercy. The studs that are loose have enlarged the hole enough over the years to allow the studs to move slightly. I wouldn't put them back on a track/race car. The way these are done, they should have never been on a track car to begin with. Some may consider them unsafe, but on a street car, they would be fine. Priced accordingly.