Extra mattress rail stopper combines a mattress sliding stopper with a headboard. It prevents the mattress from sliding off and creates additional storage space at the nightstand. material and construction. The rail stopper is built from thick, durable material that resists deformation and rust. Suitable for use with any mattress. Easy to manage the setup and protect your bed. A metal locking plate helps secure the bed frame when needed and protects the frame from scratches. The plate can be moved or removed as required. Universal design for broad compatibility. The mattress mounting bar is adjustable in both width and height, so you can set it to a comfortable height compatible with most bed frames. Practical use scenarios In a standard master or kid's bedroom: keeps the mattress firmly in place while freeing up added storage space near the nightstand. In a guest room with varying mattress sizes: adjustable width and height allow a secure fit for different mattresses without compatibility concerns. During moving, reorganization, or temporary locking needs: the metal plate can lock the frame to prevent movement and can be relocated easily when not required.