I've just found a Campag UT-BB120 in my tool box which I'd completely forgotten about. It fits the lock rings and will be going in my race bag as a field service tool.
This and the Park Tool equivalent work well enough, but I'd prefer something like the BBB.
The BB cups have "stops" at the end of the grooves to keep the wrench centred, which the lockrings don't, so when applying torque I find the wrench can slip.
I've just found a Campag UT-BB120 in my tool box which I'd completely forgotten about. It fits the lock rings and will be going in my race bag as a field service tool.