This metal frame supports your full or queen size mattress and boxspring and provides a low profile support. This frame will hold your box spring 4.125" From the ground using the casters included with it. It comes with six caster feet with a centre support, is 67.875" In length and uses nut & bolt assembly. For an extra low profile frame, you can purchase six additional "short glides" to replace the rug casters. This would then lower the frame to 2.5".