Product Testing & Review: HSU All Aluminum Alloy Extension Arm Kit for GoPro Hero DJI, & Others. This EXTENSION ARM FOR ACTION CAMERA or extension pivot arm can hold your action camera and adjust the angle you want for more creative shots. This Aluminium Extension Arm Metal Pole is suitable for GoPro Hero 9 Black or GoPro Hero 10 and also compatible with other action cameras. Action camera extension arm, suitable for most motion cameras. This action camera extension arm can extend the capabilities of your action camcorder, GoPro, or other action cameras. In the meantime, the action camera extension arm is suitable for the GoPro series. You can also get creative and use it as an extension for your GoPro Shorty (or extension arm for any tripod or extension poles), bicycle handlebar mounts extension, or even for helmet mount extension.