Milliard Super Heavy Duty Adjustable Queen/King with Double Center Rail and Gliders Overbuilt frame construction provides superior support and resists bending or breaking to accommodate big and tall mattresses. Thoroughly welded double center support rails with extra legs reinforce every bed frames weak spot: the middle. Frame members interlock with sliding sockets for easy, but secure assembly without tools. Recessed edges and end caps minimize accidents and maximize safety. Extra-wide reinforced headboard brackets are designed to fit headboards of almost any kind.