When presenting measurements to a customer in USA is it better to use fractions or decimal?

For example:

5 13/16" X 7 1/2" X 9 3/8"

Or

5.8" X 7.5" X 9.3"

Decimal may at time reduce the amount of numbers needing to be displayed. Hopefully making it easier to understand. Those in metric countries probably would understand this intuitively.

What do you think?