The Black Arm is a hard-mount three-axis stabilizing system made for a variety of camera gimbals. 
The damping action of all axes; vertical, tilt and roll are created by custom-made actuator hydraulic dampers that are fully adjustable. The Black Arm Complete kit comes with an additional anti-vibration camera gimbal mount to absorb high-frequency fluctuations from road noise and engine hum.
The Black Arm is the film industry’s standard for camera vehicle mounts. Purely mechanical – the Black Arm is easy to use and maintain. Mounting the Black Arm is as simple as clamping it onto a standard 48-52mm speed rail.
You can mount the Black Arm on a multitude of transporters and vehicles such as; dollys, cars, ATVs, boats, motorbikes, scooters, snowmobiles etc.
The Black Complete has a vast payload weight range; between 5-32 kg (11-70.5lbs). It ships with two sets of springs (7.0 & 7.5), and two sets of dampeners for each damper position (a total of 6 dampeners).
A 22-step knob enables you to precisely dial in the amount of damping you need for your shot.