The IceToolz Lockring Tool M801 is used for fitting / removal of the front chainring on Bosch electric bike motors.
Compatible with Bosch Active / Performance Line electric bicycle motors featuring a small (14-22 tooth) front sprocket - this does not fit later systems that use a larger front sprocket.
51mm outer diameter
8 notches (4.75mm wide)
High quality steel
Use with a 1/2" drive 2-way ratchet
You will also require a crank puller to remove the crankarm.