[Easy to install]No paper instructions, each metal mattress stabilizers comes with 4 screws, just put the screws through the installation holes, then use an electric screwdriver to drill the screws into the wooden bed frame to fix the mattress holder [Mattress Retainer Bar Bracket]Dealing with a slipping mattress at night? Having to push back your mattress in place every morning? mattress retainer bar keep mattress from sliding, no more having to adjust the mattress daily [High quality material]The mattress holder are made of thickened high quality steel iron, with black painting, to rust, colorfast and smooth, without deformation or breakage, which is secure to use repeatedly [Wide Application]Non slip mattress gripper fits for adjustable bed, RV bed, wood bed and other bed frame. Make sure the width of your bed frame mounting location is no less than 1.5 inches.