Confused: What size wrench for these bolts???

G'day folks, it's been a while since my last upload, but I have decided to put my conundrum to the internet community. What bloody size wrench/spanner do I need for these bolts? It's got me absolutely bamboozled. Cheers 🥂 in advance, JD.

[@garyhiddins1562]

It may be Whitworth. Whitworth tools are sized by the bolt/nut thread size rather than the hex size. What happened to the Warn Winch you stripped years ago?

[@stukyu]

I noticed you didn't try 12mm ?

[@aussietruckphotosandmodels8510]

Many years ago ( 50's 60's ish ) the British sold all their old Whitworth tooling to India and China. so India and China used it until it started to wear out then made modern versions of it. Roll on to the 90's and 2000's when Bunnings showed up in Australia and the likes of Texas in the UK . They wanted a load of cheep fasteners and as they were already buying cheep crap from China any way, why not get more crap in the form of nuts and bolts. Most of the buyers don't seem to have very much tech knowledge, they're just sent out to buy cheep crap in a fancy box that'll brake after a few weeks any way. Who give a stuff about a DIYer that's just going to use a pair of monkey wrenches any way.. I can't answer for the USA as I don't know what fasteners Home Depot sells..