The Zacuto Z-DADPT Half Inch Adapter is the all in one adapter. It can screw into any Zacuto female rod or Zamerican Arm. It adapts a Zacuto rod or zamerican arm from 15mm to either a 1/4" 20 or 3/8" 16 male screw. The 3/8 " 16 male screw end is also hollow with a female 1/4" 20 screw hole inside. This is the perfect all in one tool to have in your camera bag.