Apparently you have your current measurement units set to "mm"
Other than, for example, Illustrator, with InDesign scripts you are always working with the measurement units that are set in the application.
What Tomaxii said, or add this to the top of your script
app.activeDocument.viewPreferences.horizontalMeasurementUnits = MeasurementUnits.POINTS;
app.activeDocument.viewPreferences.verticalMeasurementUnits = MeasurementUnits.POINTS;-- don't forget to restore it back to mm at the end.
Yes, because 41 mm is exactly 116.22 pt
Thanks a lot, its working fine............