The quantity is two, equipped with screws, just need a screwdriver to tighten on the bed frame. This is a simple and efficient prevention of mattress movement stopper, we specifically designed and produced for the bed frame factory Made of flat and thick metal, not easy to deformation, the treatment, strong and Can be used for your home, vacation home, RV and other bed frame of various sizes, to determine the size before purchase, and whether it is suitable for screw installation can be.