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Dan, a screw back is a threaded stud with a thin round "nut" for a lack of better word. They are found mostly on a hat badge, your class a hat usually has a hole for you to attach your hat badge to, 99.9% hat badges have a threaded stud with a thin round nut and a pin stud at the top of the badge, the pin helps to center the badge. I don't know any other way to tell you than this.