On Thu, 22 Oct 2015 13:59:28 -0400, Stormin Mormon
wrote:

Doing some vehicle work yesterday. SAE socket set
won't work, becuae 10 MM is between 3/8 and 7/16.
And 13 MM is between 1/2 and 9/16.

Suppose I buy metric socket set. Will I have the
same problem workign on English size fasteners?

Do I need to wrench sets in each vehicle?

You buy a "combo set". SAE and Metric. I have sockets and wrenches
in combo sets. It ticks me off American made cars require both.