Aluminum

KOGEL Shimano Preload Crank Arm Fixing Bolt.Looking for another opportunity to increase the durability of your drivetrain and customize the look of your Shimano crankset?Kogel's Shimano crank arm fixing bolt is here to help keep the crank arm bolts from backing out.Made from the T6061-T6 aluminum alloy, our Shimano fixing bolt adjusts the side load on the bearings and holds the arm in place while you tighten up the crank cinch bolts to the proper torque spec.Long: compatible with current Shimano HollowTech II road cranksets including Dura Ace R9100, Ultegra R8000 and 105 R7000. Previous generations might have used the short version, like early productions of the Dura Ace 9000 crank sets. But that was corrected later on.