4-BOLT UPPER LOW FRICTION PRECISION BALL JOINT WITH STEEL BALL STUD & STEEL HOUSING WITH AN ALUMINUM TOP CAPMOST POPULAR RACING, 4-BOLT, UPPER BALL JOINTLARGE BOLT CIRCLEFITS THE MAJORITY OF FABRICATED, 4-BOLT, RACING UPPER A-ARMS, INCLUDING ALL SOUTHWEST SPEED UPPER A-ARMS (EXCEPT #101-067 - #101-070 METRIC A-ARMS AND #106-060 - #106-075 CAMARO A-ARMS THAT HAVE THE SMALL PATTERN)ALSO FITS MOST RACING & PINTO SPINDLESPRECISION BALL JOINTS OFFER VERY LOW RESISTANCE WHILE STILL FULLY CAPTURING THE BALL TO MAINTAIN ALIGNMENTALLOY STEEL BALL STUDS ARE PROCESS-COATED FOR LOW FRICTION & LONG WEARRUGGED STEEL HOUSINGS WILL WITHSTAND IMPACTS THAT WILL DESTROY OTHER BALL JOINTSINTERCHANGES WITH THE ORIGINAL SOUTHWEST SPEED BALL JOINT #101-016, WHICH CAN BE SEEN HERE WITH ITS STOCK APPLICATIONS LISTEDALSO, PRECISION BALL JOINTS ALLOW YOU TO EASILY CHANGE THE BALL STUDS TO MODIFY THE ROLL CENTER ON YOUR CARCLICK HERE TO SEE THE BALL STUDS WHICH ARE AVAILABLE FROM .100" TO .500" LONGER THAN THE STANDARD STUD