Loading... Please wait...This rail system is designed for full size headboard and footboards that need to accommodate a Queen size mattress set. Made of Sturdy Steel for years of durability. Inverted angle iron with hooks - converts a 4/6 bed to a queen size. "L" clips secure the box spring and allow for additional width of 3" on either side. One solid cross rail for center support. Shipping is $29.99 on this item.