Queen Modi Plate Parent The Queen Modification Plate is designed to attach queen bed frames to size full headboards, or full bed frames to queen headboards. It can also be used to convert king headboards to cal king and vice versa. This comes as a saving grace for special projects or unique headboard sizes. The steel construction creates a heavy-duty connection, securely fastening the headboard to the frame. This set includes two modification plates. L : 11.38 - W : 9.13 - H : 5.75 - W : 26