ePhoto Articulating Magic Friction Arm Small Super Clamp For Dslr rig LCD Monitor RigClamp
Super Clamp plus extender w/ 1/4" and 3/8" thread. The Super Clamp is made of lightweight cast alloy and is a very versatile tool that  holds just about anything: cameras, lights, umbrellas, hooks, shelves, plate glass, cross bars, even other Super Clamps.