The Half Inch Adapter is the all in one adapter. It can screw into any Zacuto female rod. It adapts a Zacuto rod from 15mm to either a ¼” 20 or ⅜” 16 male screw. The 3/8“16 male screw end is also hollow with a female ¼” 20 screw hole inside. This is the perfect all in one tool to have in your camera bag.