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The queen bed frame is commonly used for the queen-size mattress. However, the king bed frame is used for the king-size mattress. King bed frames are usually wider than queen bed frames. In addition, they can be folded up easily without any hassle. The queen bed frame cannot fold flat and requires extra space. To get more information visit https://www.amazon.com/eLuxurySupply-Metal-Bed-Frame-Foundation/dp/B0844GXSM3