Haven't actually used it yet, but it's necessary if you want to reduce the noise created by DT hubs with 36 or 54 tooth ratchets while coasting. I really dislike the screaming sound of most modern hubs which gets worse as you increase the number of POE. Completely destroys the peace and quiet of gravel riding. I won't use ratchet until I can build the wheels. Quality appears to be what I would expect of an original DT part made for their hubs. Nice it comes with grease!