Need a socket or wrench for a 8-3/4 plug

Main Problem is I don't know what to call it. Is it a 1/2" Drive 4 Point 5/8" Socket, Adapter, what?
Got any tool trucks cruising around town? MAC, Snappy, Cornwell, Matco should all have a male square drive on their truck. A adapter will twist off. It has a hole for the spring and detent ball in the end.

square drive.jpg