Q-Mount Studio

"Zacuto's univeral Z-Release mount for 19mm rail systems. Used to mount Zamerican arm, other arms with Zacuto Zuds (available in 3/8 16"" and 1/4 20"" both male and female) or 15mm rods. The q-mount is also used to create a lens support by adding a 1/2” to 1/4 20” adapter and a short 15mm rod. If you are looking for a lens support, check out Zacuto's Locking Lens Support.
Q-Mount Studio (Zacuto’s universal Z-Release mount for 19mm rail systems. Used to mount Zamerican arms, other arms with Zacuto ZUD adapters or 15mm rods)"