The Field Optics Research Optics Window Mount 3/8-16 Universal lets you support your camera, binoculars, or small spotting scope on an open car window while you are sitting in the car. Simply place a a tripod head or other mounting system on the window mount via the standard 3/8-16 screw, the same size screw found on most tripods. The material that touches the glass is non-scratch to ensure your windows aren't damaged. The mount sits on top of the open window and fastens via the knob. A control arm with a broad handle lets you precisely maneuver your optics. Be sure to purchase a binocular tripod adapter if necessary.