Disc Brake Centerlock Rotor Lockring
Internal spline lock rings are sold out, unfortunately we don't have an ETA on them. Sorry.
Use the internal spline lock ring for rear hubs and most front QR and 12mm hubs. Use the external spline lock ring for 15 and 20mm front hubs, and all White Industries CLD front hubs. White Industries CLD builds include an external spline lock ring for the front hub only.