The AV Stumpfl monoblox64 middle strut is a frame-system component designed for 16:10 projection screen configurations measuring 325 × 211 cm. It provides central support within the monoblox64 frame structure. The component is supplied as a single piece and is identified by manufacturer article number BXV-XW325/MST. It is not a projection screen or projection surface and therefore has no projection area or surface gain specification.