Wolf Tooth CenterLock Rotor Internal Splined Lockrings for securing centerlock rotors to centerlock hubs. Machined from 7075-T6 aluminum at Wolf Tooth in Minnesota, USA.Compatible with 12mm thru axles and QRMachined 7075-T6 aluminum with durable anodized finishTorque to 40NmSlim design of lockring with its internal spline allows for use on frames/forks that do not have clearance for the existing Wolf Tooth Centerlock Rotor External LockringNot compatible with 6-bolt rotors and hubs Wolf Tooth CenterLock Rotor Internal Splined Lockring Disc Rotor Parts and Lockrings UPC: 810159400916