Wolf Tooth CenterLock Rotor External Splined Lockrings for securing centerlock rotors to centerlock hubs. Machined from 7075-T6 aluminum at Wolf Tooth in Minnesota, USA.Compatible with 12mm, 15mm and 20mm thru axles and QRMachined 7075-T6 aluminum provides strength with weight savingsDurable anodized finish provides added protection and premium lookTorque to 40NmNot compatible with 6-bolt rotors and hubsWasher included Wolf Tooth CenterLock Rotor External Splined Lockring Disc Rotor Parts and Lockrings UPC: 810006808438