Cameras typically have a 1/4 inch threaded hole to screw onto a 1/4 inch bolt like on the top of a tri-pod. My question is simply, is this mount the same size in countries that use the metric system? Or do camera companies have to make models according to what country it's sold in? Since almost the whole world uses metric and Cameras are designed and made (for the most part) in countries that use metric, I've always found it odd that the standard size is 1/4 inch instead of say 7mm or something.