Are you going to install new cranks? Look no further. This is the tool you need for the preload adjustment on Shimano Hollowtech II systems. The best thing about this model is that you don't need any strange tools: it has a 6mm hex port so you can use your standard Allen key or a torque wrench if you are one of those who cares about tightening torque to the millimeter.

👌🏼 Dual use: Splined edge for tightening by hand and hex center for the final adjustment.
✅ Full compatibility: Works for your road or mountain bike.
Essential: If you work on the drivetrain, this part has to be in your toolb...