Wrench to be used with a bottom bracket tool? It looks like a wrench with a cup at the endpoint. I was wondering what is this tool called and whether it's meant to be used by itself or in combination with a bottom bracket tool, like the PT BBT-22, for example.
The tools being used there are:


Bottom bracket tool
Large socket to engage with the large hex head on the BB tool
Sliding T-handle socket driver


Some bottom bracket tools such as the Park BBT-22 have a 3/8 socket drive built in, so the large socket isn't necessary.