They are great since you
"They are great since you don't have to use an extractor tool to remove the crank arms. I am not sure if they work for other brands such as Shimano or Raceface but they are perfect for Truvativ GXP type interface. For Truvativ ISIS and Howitzer interface you'll need the M12 version. Also keep in mind the GXP cranks are 2 piece so you only need one on the non-drive side and each of these comes in a pair. I made a mistake of order more thinking they only come w/ one bolt. They might fit other Truvativ non GXPs except for the ones I mentioned, that may need one on each side just make sure they take M15 bolts and you are golden."
