How do you usually take off and install the chain guard?
With hook wrench? With pin punch and hammer?
Now you can use this lock-ring tool for your chain guard!
C-135 is going to smoothen and not fail in your work. And you can work more safely when you install an attached “Guide” to the axial tip of BB. This tool can work for 3 notches, 4 notches, and other types of lock-rings because it attaches with only one hook and wrap around the lock-ring.

Suitable lock-ring OD.: 45.7mm