The Mantua Plus Bed Frame can adjust to perfectly fit all sizes. The Plus Bed Frame adjust from 38 to 76 inches to you can use it even if you someday buy a different mattress. Made from sturdy recycled railroad steel, the bed frame includes a center rail for extra support, while the Insta-Lock feature secures your box spring for added stability. No tools are required for assembly, making the bed frame quick and easy to put together.