RJX X-TRON 500 Plastic Ball Link (Short) # XT80019 (10pcs)
If you've purchased these to fit the HK500 or T-rex500 rods because the ball links on the RJX 500 head are too large, you'll be disappointed. They will not fit the Trex500 or HK500 roads. The inner diameter is too large. Forget about using these. Either replace the RJX T-rex500 grip ball links with align ones or use a ball reamer to resize the Align rod ends.