Stupid question: Is it marked 31/32 or did you measure it and found it to measure 31/32?
I don't believe there is a std bolt head 31/32 across flats
I buddy of mine gave me a 31/32 Snap On 3/4 drive, 12pt socket they other day. I don't have that size in my tool box, wondering what it was used for commonly back in the day or currently? Thanks