Milliard 9-Leg Support System Adjustable Heavy Duty Bed Frame - with Lockable Rollers/Wheels Thick frame construction provides ample support and resists bending or breaking while retaining a semi-portable form factor. Center rail is supported with extra legs to reinforce every bed frame's weak spot: the middle. Most of the frame members interlock with pins and sockets for easy, but secure assembly. Recessed edges and end caps minimize accidents and maximize safety. Adjustable to: Full, Queen, King, Cal King. Reinforced headboard brackets are designed to fit headboards of almost any kind.