The MetalCrest Supreme bed frame is most popular adjustable bed frame. Twin/Full/Queen/California King/Eastern King - center support - 6 legs. Made of heavy duty high carbon recycled railroad rail steel for unparalleled strength and durability. Water-based, lead-free black finish. Solid rivet construction ensures durability and stability. Secured locking mechanism is permanently attached. Recessed triple-thick steel legs provide more toe room. Heavy-duty headboard brackets. Size: California King King Queen Twin Full. Gender: unisex.