The VarioClip Lock middle strut top is a frame or system component manufactured by AV Stumpfl for the VarioClip Lock product series. It is finished in black and supplied without studs or press buttons. The component is identified by manufacturer article number BCM-X/MST/OT and is sold as one piece. As a frame component rather than a projection screen or surface, it has no applicable projection area, aspect ratio, gain, or projection dimensions.