Wrong Scale

I create a ring in the wrong scale. I used Meters Architectural need Small millimeters. What is the best to get the whole object to mm

To change the scale of a file:
Options > Document Properties > Units
Change the units from meters to millimeters
Rhino will ask “Scale model by 1000?”
If the numbers of the dimension are correct but the units are wrong click No. (For example the file was created using the dimensions for millimeters but the units were set to meters.)
If the objects are the correct size but the units need to change click Yes.

If you need to change the size of objects in a file but the file has the correct units use Scale. The scale factor from a 30 meter object to a 30 mm object is 0.001 or 1/1000.

Thanks it worked