USA tried the metric thingy…..
Went over like a lead balloon. You may keep it down under!
Not just "down under" but pretty much the whole of the rest of the world. The US needs to catch up.
wait until the Metric system is mandated!
I believe that ratchet wrench drives in metric countries are 3/8", 1/2", etc. Also, the metric pipe thread standard is from the hallowed UK BSP standard.
All you need to remember is that 1mm=0.0394
And keep a calculator handy?!