Milliard Sturdy Adjustable Twin/Full Metal Bedframe with Casters Sturdy frame construction provides superior support and resists bending or breaking to accommodate various mattress and box spring sizes. Adjustable end rails allow for sizing the frame to keep up with expanding needs Frame members interlock with sliding sockets for easy, but secure assembly without tools. Recessed edges and end caps minimize accidents and maximize safety. Modular headboard brackets allow for addition of most types of headboards