Found this well-used hex to square plug about a month ago. Been figuring on what to do with it. Decided to make an adapter so I could use sockets with a Gear wrench (or any ratcheting box wrench for that matter).
I drilled and tapped a small hole in the hex end of the plug, then countersunk it. Took a fender washer and countersunk the hole in it, and attached it to the plug. The washer prevents the plug from pushing all the way out, and gives one a nice finger hold when popping on a socket. Works great!