Shimano's centerlock brake mount is solid and makes for a great way to fix the brake rotor to your hub. But if you've already got a set of nice disc brakes with 6 bolt rotors, you can use this Shimano Centerlock to 6 Bolt Disc Rotor Adapter to make all of your parts fit together.This adapter kit includes a splined rotor mount that slides right onto the splined portion of your Shimano centerlock hubs. Six studs capture the rotor and a six bolt washer, lockring, and circle clip hold it all secure. You can use a standard Shimano lockring tool for installation and removal.The Shimano Centerlock to 6 Bolt Disc Rotor Adapter includes the parts necessary to install a 6 bolt rotor on one centerlock wheel. You'll need two of these adapter sets to do one bike, front and rear.