Originally Posted by
jimjim1
I have not checked but I seem to recall that 5/16 is v close to 8mm
Then you don't get a decent hit until 19mm and 3/4 which are also interchangeable.
I don't recommend this for work on Aircraft but it's OK for plumbing.
12.7mm / 1/2" is close enough to 13mm, and vice versa, for working on old Morris Minis...
I'm 55, metrication arrived in Australia in my mid Primary school years, so I'm pretty much bilingual. I did my engineering degree ten years after leaving school, with a cohort who are now 45. They were notably less comfortable with imperial units, and the university went to enormous lengths to avoid anything non-metric, leading to some interesting odd numbers when doing practical classes on old steam equipment.