Ben T wrote:

> Larry,
>
> Why buy something close when you can buy the right size? If you already have the SAE size that's great. If you have to buy one, get the 46 mm, right?
>
> BenT

1 13/16 " =  1.8125 "
   1.8125 X 25.4 = 46.0375 mm
  Close enough for me.
In a size that is unusually large, the metric version may be harder to find and/or more expensive.

my 1/50 of a dollar
Larry A.