Magic Arm Mount 12mm Double Ballhead 1/4" Screw for DSLR Camera DV Monitor Light
Type A~Type G: New Design Magic Arm with Stainless Steel 12mm Ball Stud Ended Bolt Dual Head 1/4" Screw Bolt. Knob lock, Aluminum alloy knob, clockwise to lock and fix, counterclockwise to loosen and adjust.