This is a Ball Joint Stud for the Polaris Rzr XP1000. These replace the factory ball joints when you have aftermarket A-Arms. They are made from stainless steel and machined for precise fitment. They fit a 3/4 rod end. They can be used in Wolfpack Chromoly A-Arms. You can also fabricate your own A-Arms and use these as the ball joints matched with 3/4 rod ends. These Ball Joints can be universal. These are 10 times Stronger than factory Ball Joints and we have not had 1 Failure in 4 years of racing with this part.