If you have a place shop near you that works on farm equipment they will most likely have 8 point sockets that fit square nuts. Alot of the older farm stuff has square headed nuts and bolts. I have a complete set and if the plug hasn't been rounded off the socket on a 1/2" impact will back them out. The 8 point sockets are also handy for using on the square end on thread taps since sometimes there isn't room for a regular tap handle to swing and being able to use a ratchet is faster and less tiring.
