These are only compatible with Tail Rails and Badger Rails
Loose inner hub bolts on the trail, no more! This easy-to-install hub bolt locker keeps your bolts tight and is easy to uninstall for maintenance.
Remove one of the rails to enable assembly.
Push the black spacers into the rails. These will hold the bolt locker in place.
3. Tighten Hub Bolts
4. Insert hex pieces with rounded end facing up.
5. Install per video below:
Video didn't play that's supposed to show me how to install. No info online on how to install. Not straight forward. Bought 4. They will sit on a shelf I guess