2.1mm ID, 5.5mm ODFrom the product data sheet it would appear that the depth is about 12mm.
'"Pot" is generally the abbreviation used to mean a potentiometer, which is a 3 terminal variable resistor, where as you obviously meant "connector plug".
Thanks for pointing that out. I must of thought that I'd seen it written that way somewhere. I meant the receiving end though, so not the plug, though the important dimensions of the two are the same.
"Jack" might also be a term for the female connector. I think I've used the below plug with my arduino. "M" might be the size.http://www.radioshack.com/product/index.jsp?productId=2103614&znt_campaign=Category_CMS&znt_source=CAT&znt_medium=RSCOM&znt_content=CT2032231