Usage Tips:[Stop Mattress Sliding] If you are bothered by the mattress sliding on the bed frame, or the mattress always slid off over time as you sat up with back against the headboard. The anti bed frame grippers can solve your troubles. Anti mattress gripper for bed frame will help you to hold mattress in place and stop mattress from sliding. [Wide Adaptation] Adjustable non mattress baffle is universal model and keep mattress topper from sliding. The anti mattress gaskets suitable for bed frame with a tube width of 0.3 to 1.38 inches. [Durable & Not deformation] Adjustable bed mattress retainer bar are made of high-quality and heavy-duty thick steel, electroplated black to prevent rust and corrosion. The thickness of mattress brackets for metal bed frame is 3mm, which is 50% thicker than other , so it is more stable and not easy to fall off. [Easy Installation] Mattress holder in place bar is easy to install and dismantling, the winged screws configuration can holds sleeping cushion plug immovably to the edge of the bed outline, without extra tools. [Package Contents]: These mattress stoppers include 2 Pcs mattress holder . If any mattress non gripper are found to be defective or any problems arise during use, please to contact us directly for a replacement or refund. --- NOTE:Our Non Mattress Gaskets have been upgraded and optimized to be very effective in prevent mattress from sliding. Colour:black Material:Metal Package Contents: 2 x Non Gripper For Metal Frame Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.