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

The plug has a female 5/8" square in it. I found an old old Mac adapter type extension on eBay. It is 1/2 female to 5/8 square male. That is what I needed. I also found an old old ollllld school plug wrench. It is antique. I am going to give the antique wrench to the friend who is going to change the fluid for me. I don't have a cement floor to work from. In a rural area. But thank's for all your replies. They are called "drain plug wrenches" I don't know if they still make Standard anymore, but they have quite a few new mm wrenches on ebay.