The AV Stumpfl monoblox64 middle strut is a structural frame component for constructing a 4:3 monoblox64 frame system. It is specified for a frame size of 630 × 477 cm, equivalent to 20 ft 8 in × 15 ft 8 in. The component is supplied as one piece and is identified by manufacturer article number BXV-XV630/MST. It is not a projection screen or projection surface and has no video signal connections.