On the very tip of the Shimano FC-M770 crank arms there are some markings. They are to be found on both crank arms on both of my sets, so they are definitely no random scratches. I suspect these are leftovers from the hollow forging process, but I am not entirely sure. Furthermore, why has Shimano decided to not machine the tip of the arm in order to remove these markings? I mean It's an XT crank, cheaping out shouldn't be the main reason here.