Compatible with the 3rd and 4th generation Bosch motors. Allows for tightening and loosening the lock nuts of the Bosch E-bike motor, enabling the replacement of the spider and chainring. To ensure that the required torque forces are safely transmitted, the tool is fixed in the motor shaft by its integrated guide and connected to the counter nut via a pull-push mechanism. This guarantees a secure fit on the crankshaft. The teeth are designed in a reinforced shape to apply high torque when loosening or tightening the counter nut. Guaranteed to be slip-resistant. The tool can be used with a snap-in tool holder or a 32 mm ring wrench.