I would like to make a wrench similar to a Craftsman dog bone wrench. I have searched the web and on here, but I cannot find the dimensions for metric and standard size wrenches to begin my project.

Does anyone know where I can find these dimensions?

A good video tutorial would be wonderful, but there is none on Youtube or here that I can see.

If anyone has seen or made something similar to a Dog Bone wrench, with precise metric and standard measurements for common sizes, such as 13 mm and 1/2, I would love to know about it.