OK. I thought that I had just about every collet listing in captivity but this one has several collets that aren't on any of the lists that I had. Thanks. I'm glad that that question is now settled.
In case you haven't figured out what the columns headed Round, Hexagon and Square are, those are the largest size for each of those shapes that collets were made for.
I do notice that one dimension that could be critical in ID'ing an unknown collet closer adapter is not on the chart, and that is the collet head taper angle. Also, as long as the list is, it includes no metric collets.