Quickly mount to track systems with a .32in T-Slot width using the included hardware. The metal arm provides solid support while minimizing vibration. Dual thumbscrews allow you to quickly loosen/tighten the ball and socket joints to allow unlimited positioning. This arm will not break, bend or boogie on you. It will stay right where you left it. The heavy duty cradle works with devices up to 3.4in wide. Designed for one handed insertion/removal. Metal construction with rubber lining paired with industrial springs to hold your phone securely.