The AV Stumpfl monoblox64 middle strut is a frame or system component for the monoblox64 projection-screen system. It is designed for 4:3 screen configurations measuring 691 × 523 cm, equivalent to 22 ft 8 in × 17 ft 2 in. The component is supplied as an individual piece and has a net weight of 7.5 kg. It is not a projection surface or screen and therefore has no projection area or gain specification.