Hydra Quick Release Rod Clamp for the Red One Camera. The Hydra clamp has a 5-way locking collar for their 15mmm Quick Spud to easily mount any 1/4-20 threaded accessory.
The HYDRA comes in in 19mm, 15mm or special order Panavision size jaws. It's also tiny at just 3.5 oz and 2.65" long, yet is holds a lot of weight and allows for easy on-off without having to remove rods because of its spring loaded, open-ended jaw.

More info here: www.monstercine.com