【Simple & Efficient Prevention】Specifically designed for , this mattress retainer effectively stops mattress sliding and shifting with minimal installation effort. 【Complete 4-Piece Set with Screws】Includes 4 metal stoppers and mounting screws—just use a screwdriver to securely attach them to your bed frame. 【Durable Flat Metal Design】Made from thick, flat metal with treatment, these mattress slide stoppers are sturdy, to deformation, and built to last. 【Universal Size Compatibility】Measuring 26 x 9 x 8cm, these bed blockers for under bed can be used in homes, vacation properties, RVs, and various bed frame sizes (check compatibility before purchase). 【Quick & Secure Installation】Easy to install with just a screwdriver, this mattress retainer bar provides a reliable, low-profile solution to keep your mattress firmly in place.