In the 1980's I purchased a set of Snap-On sockets that fit into a 5/8" hex wrench, using an o-ring to retain the socket. The chrome plated set had two main features 1) they were low profile, fitting in tight spaces and 2) the bolt or threaded rod could pass thru the socket, allowing it to be slid down a long bolt thread to the nut. I used them with a 5/8 - 11/16 ratcheting wrench but maybe there was a special wrench meant for the set?
Maybe this wrench is for this application?
Al