Please use metric exclusively in your web sites. Americans are ready to have only one system. Dual units are more confusing. The current USA system of measurement is English units. For NASA to purchase hardware in the USA, they MUST specify English units.
Shop tries to makes part.
Shop orders metric tooling. Shop finally makes part. Multiply that by the thousands of parts that go into one spacecraft or Space Station component. Now multiply that by the number of spacecraft and components built each year.