The Wolf Tooth Centrelock Rotor Lockring Internal Spline is made to secure a centrelock rotor onto a centrelock hub. The internal spline ensures it can fit onto frames and forks that don't have enough clearance for its external spline sibling.
Slim in design and available in a wide range of colours to match the rest of the Wolf Tooth components on your bike, it is made for compatibility with 12mm thru axles and quick release axles.