Ultimate ball joint. Adjustable press-in mounting. Stud has .5" extended length. For use in lower location on GM applications. QA1 offers its Ultimate Ball Joint in a Press-In Style for a variety of racing applications. A 100% owner rebuildable design, the Ultimate Ball Joint is a QA1 exclusive. This patented, self-lubricating ball joint is offered with multiple stud lengths, providing for easy geometry changes. Infinite preload adjustment allows breakaway torque to be set as low as 0 ft. lbs. for a completely smooth, bind-free operation. Precision tolerance ball-to-race conformity results in even load distribution for unsurpassed wear resistance. Precision ground 52100 bearing steel race ensures long life and ultra-smooth operation. No need to remove the ball joint from the car for adjustment. Enhanced by self-lubricating components to ensure smooth operation. Fine tune your roll center. QA1 ball joints are owner rebuildable, and all parts are replaceable at economical prices.