MALOUF Structures Hook-on Metal Bed Rails with Center Bar and Adjustable Height Support Foot - Twin/Full Size Hook-in headboard and footboard attachments Center support bar with leg and glide foot Support leg height adjusts from 6.5 to 15.5 inches Connects to headboards and footboards to support box spring and mattress Includes two 1.5" x 1.5" x 78" side rails with center bar; 3-year warranty