Chainring lockring tools from Park Tool.

• Fits Shimano STEPS E6100, E7000, E8000 and E9000 e-bike motor systems
• For lockrings with 54mm outside diameter with 16 notches
• Replacement for Shimano TL-FC39 tool
• 36mm hex drive to be used with Park Tool TWB-36 Crow Foot and a torque wrench to properly measure torque