AVOID SLIPPING：mattress slide stopper can firmly fix the mattress and avoid sliding. The surface is painted black to prevent rust and resist corrosion. Our mattress retainer bar are 3mm thick. EASY TO INSTALL ： The mattress retainer bar for adjustable bed is very easy to assemble, just use a screwdriver or electric drill, just drill the screws into the base of each non-slip mattress washer bar.