MALOUF Structures Hook-in Metal Bed Rail System with Cross Wires - Queen Sturdy construction for reliable support; designed for use with a box spring or bunkie board Standard hook-in connection brackets accommodate most hook-in headboards and footboards Two optional parallel cross wires can be used to square-up the frame; if your bed is irregularly sized, using only the side rails is sufficient Designed with an extra 3 inches of length to allow space between your mattress, headboard, and footboard to tuck in or drape sheets and comforters Protected against manufacturer defects with a 3-year U.S. warranty