UUrig R062 mini magic arm:
3/8" screw with Arri locating pins to 1/4" screw. 1/4" end also has a retractable pin which can stop the mount spinning
This is really nicely machined and everything locks very securely.
5kg payload
Pairs nicely with the UUrig R060 super clamp using the locating pins.
NB: ball joints are smaller than the other ball joint items on this site, so incompatible