The AV Stumpfl AT64-SHIFT base module bottom part left, 3-20 is a frame or system component for the AT64-SHIFT product series. It is supplied as the left bottom section of the base module and is intended for use within the corresponding SHIFT frame system. The component is not a projection screen or surface and therefore has no projection area, aspect ratio, projection type, or surface gain specification. Article number BFZ-FST/AT64S/BM/L; country of origin Austria.