Well, bear in mind, this is a graphics program, not a drafting program, and these nodes aren't exactly 'precision' components, but this is the approximate average of some of my new nodes. Diameters on the left, vertical lengths on the right. I guess the most critical is if you intend to drill a hole and panel mount the node with the little 'snap lock' ring. Looks like you'd want to run about a 15/32 bit (12mm) and the panel shouldn't be over ~.078" thick.