That looks just like a pic of my washroom. Lots of stuff to clean up.
I just came home with two drawknives, a firehose tool, a cobbler's hammer, a Plomb WF 23 spinner with a screwdriver socket, a Plomb body hammer, and a yet unknown old, old socket set in most of a wooden box. The pieces are all marked with an A prefix. I know I have some more of them around here somewhere.
The universal joint, itself, is 4 5/8" long.
And a little bitty Vlchek WBC 1012 double box wrench. 5/16" by 3/8". It will fit right in.