Heavy Duty 6-Leg Adjustable Universal Twin/Full / Queen/King Metal Bed Frame With Double Center Support Rug Rollers & Locking Wheels Heavy Duty 6-Leg Adjustable Universal Twin / Full / Queen / King Metal Bed Frame With Double Center Support Rug Rollers & Locking Wheels. This universal adjustable bed frame fits every size and features a solid steel metal frame that gives excellent support to a mattress & headboard. The caster wheels allow easy convenience, while the center support prevents mattress sagging. Easy Assembly in Less than 10 Minutes. No Additional Tools Required.