Features: Securely prevent mattress slippage on adjustable beds with these 4 heavy duty metal retainer rod featuring not slip adhesive tape and screw fixation, tested to withstand 440 (200kg) for uninterrupted sleep stability. Adjustable width accommodates 4" 12" mattress thicknesses through tool easy installation, combining strong aluminum alloy with scratch resistant rounded edges for safe, general bed frames compatibility. Essential for travelers, elderly users, and families with active sleepers needing stable mattress anchoring in dorm rooms, hotel setups, or home bedrooms with platform beds. Maintains mattress alignment during sleep movements on wooden , sofa beds, or tilting adjustable bases while preserving bedroom aesthetics through low profile bracket designs. Engineered with reinforced composite materials that outperform plastic retainers, this anti change systems resists deformation from repeated pressure and bed adjustments. Specifications: Type: Anti-mattress displacement anti-slip stop frames component : Metal Size: about 4x9.5cm/1.57x3.74inch Package Includes: 4xMattress Holder note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.