Keller - POLARIS RZR RS1 BALL JOINTTwo Piece Ball Joints Work Better Todd Keller saw that snap rings just werent good enough to keep ball joints from popping out, so he made a two piece design that eliminated the need for a snap ring. Now you can get rid of your snap ring by upgrading to our Polaris RZR RS1 Keller Ball Joints. The better design paired with chromoly components makes this ball joint almost impossible to push out on a hard ride. The Durability You need The RS1 is all