The AV Stumpfl MonoClip middle strut is a frame component for a 4:3 projection screen measuring 691 x 523 cm. It is designed to function as a middle support strut within the compatible MonoClip screen frame system. The component belongs to the MonoClip product series and is identified by manufacturer article number BMV-XV691/MST. The delivery unit is one piece. No video signal inputs, outputs, connectors, or projection surface characteristics are specified.