These modification plates are designed to attach queen bed frames to full headboards or full bed frames to queen headboards. The modification plates are perfect for special projects or unique headboard sizes. Steel construction creates a heavy-duty connection.The set includes two modification plates, and to attach both a headboard and a footboard you ll need two sets. When installing, be sure to orient the plates so no excess hangs off the edge of the headboard or in a way that can cause a hazard in your bedroom.