This sturdy, stable, durable Twin 18-inch Rounded Edge Corners Metal Bed Frame with Under-bed Storage Space with steel slats replaces a box spring. Double sliding protects the system. We are applying double adhesive tape. This frame is bigger than the standard frame. Plastic floor protectors are applied at the bottom of all legs. No scratches on your floor and rounded edges with the plastic protector on the top of the front legs prevent bumping into sharp corners.