Regular Twin Metal Bed Frame for Box Spring Mattress. It has four legs and large brown wheels. I also have another frame with white wheels.
Height: ~7.25 inches
Length: ~5' 8" (the mattress can be longer because the bottom has no end cap. See pictures)
Width: ~2' 9" to 4' 6" (the clamps allow the width to be adjusted but I have used this frame for twin mattresses only.