Wolf Tooth Centerlock Rotor Lockrings - Internal Spline secures a centerlock rotor onto a centerlock hub. It is compatible with 12mm thru axles and QR. The slim design of this lockring with its internal spline allows it to fit on frames/forks that do not have clearance for the existing Wolf Tooth Centerlock Rotor Lockring - External Spline. Sold Individually. Compatibility Compatible with 12mm thru axles and QR Torque to 40Nm Installed using Wolf Tooth Pack Wrench and Cassette Lockring Insert Related Products Pack Wrench and Inserts Kit Pack Wrench Ultralight Cassette Lock Ring Wrench Insert Centerlock Rotor Lockring - External Spline Tech Specs 10.5g Weight: 7075-T6 Aluminum with stainless steel shim washer Material: Made in the USA Patent and trademark information