The Joby Action Clamp with Locking Arm provides a simple way to mount your action camera to flat & round surfaces. The Action Clamp attaches to objects up to 2 in width & provides a tightening screw for getting a firm tight hold against that surface. The Locking Arm features two balls joints that can rotate 360 & pivot 180 from side to side. This means that you can quickly position your action camera & get the right angle & elevation for your shot. Attach your action camera to the Locking Arm via a 14-20 screw or use the included Go Pro tripod mount when shooting with your Go Pro camera.