If your hubs feature the Shimano Centerlock splined interface rotor mounting system and you want to be able to use traditional 6 bolt type rotors, this simple to use adaptor kit allows you to do so.Features:Lightweight alloy body with splined interface and 6 fitted stainless pins with a stainless washer and an alloy lockring allows the quick removal of the rotor simply by releasing the low-profile alloy lockring with a standard HG type cassette lockring tool.