The AV Stumpfl monoblox64 middle strut is a frame component for 16:9 screen configurations measuring 691 × 397 cm. It is designed for use with the monoblox64 series and functions as a central supporting strut within the frame structure. The component has a gross and net weight of 5.5 kg and is supplied under article number BXV-XC691/MST. No projection surface, projection area, connectors, or additional accessories are specified.