Help needed. DIY monitor stand

[jon.wehrle]

I am searching for a rotating tray that clicks into place at every degree. I'm trying to build a monitor stand that can rotate 90 degrees horizontally and then 30-45 degrees depth-wise.

I think this snaps into place every 90 degrees so this would rotate the monitor from horizontal to vertical.

This i know moves freely, but I need something that will stop in degrees. What would this be called?

Thanks in advance for any bits of information or links.