Except WTF is the next size up or down from 15/64??!!!
There’s lots of great reasons to switch to metric. Inability to do basic fractions isn’t one of them…
For the record, it would be 16/64, or, 1/4
But somehow the brother is convinced, despite the fact that they left the hardware store without the bit they needed!
For the record, it would be 16/64, or, 1/4
Nope! It’d be 6mm, then B gauge (6.045mm), then 1/4" (6.350mm). And that’s not including things like over/under reamers and such.
(Sorry, I’ve been watching too much Blondihacks lately.)
Everyone has trouble with something that’s basic for someone else - we just have different skills. If these fractions are too confusing for a significant minority of people, then that’s a good reason to switch from fractional to decimal.
Except I’m this specific case, it’s about measurements for tools. Fractional is far more practical for construction than decimal for tooling.