While filming it is best to have your important gear right next to your camera. We rely on these Zacuto ZARMs to mount and hold our display and audio recorder to the same rail system our camera is on. This allows us to watch our display and audio levels while being close enough to the camera where we can make changes to our settings if needed. Simply twist the red wings in the middle of the aluminum body to lock the direction the chrome balls are pointed at! Very durable and handy gadget we use in and out of the studio!