The AV Stumpfl monoblox64 middle strut is a central support component for monoblox64 projection screen frames in a 21:9 configuration measuring 508 × 226 cm. It is supplied as an individual frame component and is not a projection screen or surface. The article number is BXV-XU508/MST, and the specified net and gross weight is 4.6 kg. No video signal, connector, or projection-surface specifications are stated.