A middle strut for the AV Stumpfl monoblox64 frame system, designed for a 21:9 configuration with a 325 × 149 cm screen format. The component is supplied as a standalone frame or system part and is not a projection surface or screen. Its manufacturer article number is BXV-XU325/MST, with a gross and net weight of 4.6 kg. No video signal connections, projection lens compatibility, or physical component dimensions are specified.