mm - inch fraction - inch decimal Some sizes cover Gauge as well
Yeah nah, in that first pic with the screwdrivers, there's a string of letters on the right, I was asking about that.
Imperial drill bits come in a series of lettered sizes specifically for drilling holes to tap. I presume it’s that.
Yep, Sid has it. Sorry, my brain saw "letters" but didn't compute somehow. Needed more coffee.
@Kimmo started
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mm - inch fraction - inch decimal
Some sizes cover Gauge as well