FINE LINE Heavy Duty super strong 6 leg frame (4 Rug Rollers and 2 center legs) with center support. Adjustable Full, Queen, King. Certified Green Product, Made in USA. Limited Adjustable Full, Queen, King with center bar going head to toe on Full and King, and side to side on Queen. HEAVY DUTY AND SUPER STRONG! Made from Recycled rail road track, high carbon steel with high tensile and yield strength which makes it superior to frames made of any other steel. Even steels that are larger in size and heavier in weight. Adjustable for use with the center support bar in all three positions -Full, Queen and King. Easy Assembly, no tools required. Headboard Bracket will fit virtually all Beds. End protection caps provided. Made in USA including all components . Limited Lifetime warranty. CERTIFIED GREEN PRODUCT. Documented by Penn State University, the production of this steel actually leaves a negative carbon foot print on the environment. Only EPA approved coatings are used on this frame.