SmallRig Magic Arm 2115 includes two ball heads on the ends, with one ball head with Arri locating pins and the other ball head with a 1/4’’ screw.  
Ballhead with Arri locating pins is compatible with the camera cage or monitor cage with Arri locating points. It prevents the magic arm from twisting, thus it increases the stability and security of the magic arm. It comes with a thumbscrew to lock the cage tight manually, or even tighter with the use of the hex spanner. 
Ballhead with a 1/4’’ screw is compatible with the camera cage or monitor directly.
It could attach the side or top of the camera cage on one end and attach the monitor on the other end.
Two ball heads come with rubber cushions that could increase the friction between the ball head and the ball head clamp, thus ensuring firm locking.

Key Features:

• Ballhead with Arri locating pins could attach camera cage or monitor cage with Arri locating points.
• Ballhead with a 1/4’’ screw could be used to attach the camera cage or monitor directly.