This is the Festool Quick Clamp 491594. All you have to do is just squeeze to clamp down the work piece.

Just squeeze to clamp, that's it.

They work with a ratchet mechanism to lock into place.

Push the green button to release the clamp.

And of course they work with the guide rails, with about 6" of clamping capacity. What can I say, these clamps are cool! I'm sorry I didn't get them sooner. They are easy to use and really speed up clamping. Well worth picking up some of these clamps.