Sturdy and Durable Steel TRADE UP TO GREAT MATTRESS SUPPORT - Upgrade your traditional bed frame and box spring for this simple-to-assemble and easy-to-maneuver mattress foundation for support that’s easy to fall asleep on DURABILITY BUILT-IN - Made completely of durable steel, this reliable design features multiple points of contact with the floor and plastic caps to protect your floor; underbed clearance space of 13 inches adds maximum functionality