We don't provide D-rings for our Travel Tripod plate nor for any of our plates.
Why? Because if you don't put enough elbow grease into the D-ring when tightening, there's a chance you'll have a loose plate. And a loose plate could mean your camera falling off.
To eradicate the possibility of such accidents, we decided to replace the D-ring with the hex tool. Now you have to wind up/loosen your plate, thereby foolproofing your setup.
That said, our Tripod is compatible with nearly all other ARCA style Tripod plates. If you really, really want a D-ring on your Tripod plate (and don't use Capture), feel free to use or purchase one of those.
Get the full story of on the D-ring here.