The one I have is size specific only one size fits. Somewhat like a collet.
Lee Schierer
USNA '71
Go Navy!
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It would be great if there were some dimensions for the size of the handle (I imagine maybe 4 inches long) and the diameter of the pin (I imagine about 1/8") and a end view picture of the tool without the pin so we could see if it has the typical pin vise details or not
Ask and you shall receive Pat. Your estimates were pretty close. rod is just about 1/8", and not the back of it which keeps it from falling out.
Lee - where did you order yours from?