And I was referring to the fact that the 1-1/16 and 27 MM are exact interchange..one of the few/ rare same size on MM/Inch conversion.
I mention that only b/c many USA guys do not have that large a Metric/MM set. but are likely to have Inch sizes...
..so, the message is don't go out a buy a 27MM metric socket simply b/c you may be unaware that the alternative could be right there in your tool box..

...but most guys already know that...........................

__________________
A Dalton