This metal frame supports your queen or king 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 eight caster feet with two centre supports, is 73.5" In length and uses nut & bolt assembly. For an extra low profile frame, you can purchase eight additional "short glides" to replace the rug casters. This would then lower the frame to 2.5".