This 500g Counterweight is designed to be mounted to the back of the Lightweight Shoulder Rig in order to better balance the rig on your shoulder.
This lets you easily adjust the center of gravity of the rig as it relates to your shoulder, allowing for comfortable operation for longer periods of time.
The 1/4"-20 thread on the back allow them to be stacked as needed.
This can also be used in conjunction with the Side Arm Counterweight Clamp and/or the Quick Release Baseplate Counterweight Adapter.
This can provide additional weight if needed when balancing your camera setup on a gimbal in more extreme situations.