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SmallRig Clamp w/ 1/4" and 3/8" Thread and 9.8 Inches Adjustable Friction Power Articulating Magic Arm with 1/4" Thread Screw for LCD Monitor/LED Lights - KBUM2732B - 9.5 inches
$24.06
"I have one of these but I found a way to add a third camera so I need a second one."