King's Brand Furniture - Heavy Duty Metal Twin Size Bed Frame With Rug Rollers & Locking Wheels Kings Brand Furniture - Heavy Duty Metal Twin Size Bed Frame With Rug Rollers &amp; Locking Wheels. Designed for use with mattress sets that use a boxspring or a foundation. The rails stop the boxspring from sliding, so it won't be off-kilter no matter how much you move it. Ultimate in strength and durability. 2 rollers with brakes and 2 without brakes. Easy Assembly in Less than 10 Minutes. No Additional Tools Required. Screws that attach the Bed frame to headboard are not included.