The Rokk Multi purpose mount has a robust ball joint system. Due to it’s heavy build and robust nature it is useful for those situations where a standard Adjustable extender isnt’ able to withstand the shock loading. The metal on metal ball design an dsocket system means that the clamping force is extremely high and the Rokk Mount won’t lose clamping force over time. The Rokk multipurpose mount gives you a tilt of 270 degrees and the ability to rotate 360 degrees. Great for those heavier sounders and GPS plotters.