I beg to differ, 18mm and 3/4 are very close, 3/4 is the larger. Its what I use if I misplace my 18mm and it a little bit loose
You can beg all you want but 3/4 & 19mm are almost identical. 3/4" is .750", 19mm is .760".
Ok, I will give you that, I know I've used 3/4 in place of 18mm, never tried it in place of 19mm, I did say it was a tad larger than the 18, but have used several times. I haven't used 19mm very often
Made me curious, 18mm is actually. 708 inches,
19mm is .748 , almost exactly 3/4. I have to convert between the 2 daily at work, I run a press brake so the dimensions are critical on a lot of jobs. Never used that outside of work until tonight, lol