Wolf Tooth Centerlock Rotor Lockrings secure centerlock rotors on centerlock hubs. They are compatible with 12mm, 15mm, and 20mm thru axles and QR. These are available in eight colors that match other Wolf Tooth anodized color accents for headsets, bolts, seatpost clamps, and more. Centerlock Rotor Lockrings are made with 7075-T6 aluminum and machined at Wolf Tooth in Minnesota, USA.CompatibilityCompatible with 12mm, 15mm, and 20mm thru axles and QRSold IndividuallyCan be installed with Wolf Tooth Pack WrenchTech Specs40Nm Max TorqueWeight: 10.5gMaterial: 7075-T6 aluminum with stainless steel shim washerWolf Tooth Centerlock Rotor Lockrings use the industry standard 4 mm thick flange and 44mm outer diameter which is compatible with all mountain bike fork/frames and many road bike fork/frames. However, there are some road bike fork/frames that require a special thinner lock ring and are not compatible. Please verify clearance on your bike before ordering. Made in the USA