I am a proud American and like to work on cars and other projects around the house.  I also have a degree in economics, so I understand the benefits and drawbacks of a world economy.   I mainly run into metric-sized bolts and the need for metric tools.  This can get a little frustrating as you have to lug around two sets of sockets and wrenches to get some projects completed.    Well, here is a chart to see the (close) equivalent sizes, inches to millimeters.  

Fun Fact: Only three countries – the United States, Liberia, and Myanmar – still officially or stick to the imperial system, while official use does not necessarily reflect everyday practice. Ounces, inches, feet, and Fahrenheit – to most people on Earth, these measurement units are unfamiliar or a distant memory. Merica!