The AV Stumpfl monoblox64 middle strut is a black-anodized frame component for constructing a 21:9 system with a nominal frame size of 447 × 200 cm. It is designed for use with the monoblox64 series and is identified by manufacturer article number BXW-XU447/MST. The component has a net weight of 4.46 kg and is supplied as one piece. No video signal connections or projection surface are specified.