Elite Middle Braces are intended for frames with larger than 72" dimensions. They are designed to connect two Elite Straight Braces together by creating multiple crosses within the structure of the canvas frame. For example, a middle brace used with a 48" x 84" canvas frame will connect the two straight braces together forming a double cross brace in the frame. With an 84" x 84" frame, two middle braces are be used together to form a quadruple cross brace. This bracing system makes it possible to construct very large, strong, museum quality braced canvas frames that are key-able at the corners as well as on every brace that connects to the stretcher bars. All that is needed for assembly is a rubber mallet, so no cutting or woodworking is required. Wood glue is recommended at the center cross for reinforced frame support.