NASA Wrench 1/2" Drive Reversible

The original NASA ratcheting wrench (included in the files herein) has a 10mm square drive. I cannot find any mention of 10mm ratchet drives anywhere, so I assume this is a custom NASA size.


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EDIT: I fooled myself when I first printed the wrench from the original NASA .stl file. When I measured the square drive part on my print it was exactly 10.0mm, and I assumed it was meant to be (because I was dazzled by such a nice roun