After pulling out my tape measure, US and metric, I found that this 10mm screw was the closest thing to the 3/8 screw, which I couldn't find. Unfortunately, while I have not used them, these screws are significantly thinner on the post and head, making them far less suitable for my intended purpose of attaching U-clips to an MBO sign. They will only be an emergency supply if I run out of the 3/8 screws I finally found.
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