Box contents: there are 2 sets in this package Total contains: 2 x same direction long extension arm, 2 x same direction short extension arm, 2 x reverse long extension arm, 2 x reverse short extension arm, 6 x long thumb screws and 2 x short thumb screws Easy to install: the swivel arm extension is lightweight and easy to use Only to install and remove by adjusting or loosening the screws You can use it with the selfie stick The adjustable swivel arm can be adjusted to the angle you need Good camera helper: the extension arm swivel arm can be used in cycling, surfing, skiing, mountaineering, motorcycling and other outdoor sports and activities You can install it in a safe place such as roll bar, handlebar seat post and helmet Versatile function: the joint mount compatible with GoPro Hero 10, 9, 8, 7, 6, 5 and other action cameras It can retain direct visibility and helps you capture the best moments You can get the perfect photo High quality material: swivel arm for camera is made of ABS plastic, the metal screws make the camera more stable and firm It is lightweight and durable The anode oxidation technology on the metal surface makes the extension arm not rusty It can be used for a long time