Originally bought for my Zhiyun Crane 3 Lab to mount my BMPCC4K with a full SmallRig cage for extra space, but then you can't use the Zhiyun quick release plate, that they need. can use their tracking focus. It's small, well made and fits the Ronin-S and Crane 2, but I didn't want to sacrifice the lens support and follow the Crane 3 without using the baseplate, so I just bought a SmallRig Half-Cage which gave me the freedom I needed and retained the ability to add accessories and I didn't have to remove the entire cage every time I needed to switch to the gimbal.