for those of you who can appreciate a well made tool, this is well worth the money. for the professional mechanic who is checking cassette lockrings on every tune, this is your best friend. you can slide this right over the QR nut and tighten up no problem. and if you have shimano centerlock rotors on your mountain bike, you can be assured that you will most definitely get your rotor seated and tight. it has a great fit and feel, its balanced in your hand, and looks sharp. youll want to show all your friends, and they will look at you like youre crazy to be so impressed by something so simple. but they just dont know, man.