These are exclusively Tail Rail and Badger Rail compatible
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.
Instructions:
- 
Remove one of the rails to enable assembly.
 - 
Push the black spacers into the rails. These will hold the bolt locker in place.
 
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3. Tighten Hub Bolts
4. Insert hex pieces with rounded end facing up.
5. Install per video below: