1/2 inch to 1/4 20 adapter

"This adapter screws into any Zacuto female 1/2 inch rod (such as a Zacuto rod or a ) and it adapts it to a male 1/4 20"" screw. It also retrofits a Z-release arm to a traditional screw type articulating arm.
1/2 inch to 1/4 20 adapter Screws into any Zacuto female 1/2 inch, such as a Zacuto rod or Zamerican arm and adapts it to a male 1/4 20 (retrofits a Z-release arm to a traditional screw type articulating arm)"