SmallRig Zhiyun Crane2 Multifunctional Baseplate 2120 is specially designed for Zhiyun Crane 2. It is fixed by a 1/4'' screw and a clamp as a second point to ensure safety.
SmallRig Articulating Arm 2070 comes with a ballhead(1/4’’ Screw) on each end respectively to expand more mounting possibilities for different shooting scenarios as per your needs.
If you use iphone 11 wide angle lens or external wide angle lens applied to smartphones to shoot, you may include the gimbal arm into image and you need move your phone away from gimbal then you need the counterweight to keep balance.