High Quality: High quality POM plastic. Adapts to various types of showers. Ensures your doors slide more comfortably. No relief and no wasted money: Did you buy a sliding system and it's broken? You think with dread that you now have to buy a new one. Forget it! There are replacement rollers for shower doors that fit all sliding systems in your home. If you have trouble sliding the shower doors, use this quick solution and don't waste your money. Use anywhere: shower door rollers for showers, massage cabins, bathtubs, hot tubs, and even for furniture accessories. Make sure the door or doors open easily and smoothly. Replace your broken system. Premium Shower Roller Rolling Component: Smooth rolling of the door with an easy effortless forward or backward movement for shower cabins, hydromassage boxes clearly perform the task assigned to them, distribute the mass of the glass, guide the movement in the given direction. This gives the product even more durability and a longer lifespan. Steel part of the wheel: 9 mm diameter x 3 mm height. Type: 4 rollers for shower door. Wheel thickness: 5 mm. Comes with screws. Suitable for 4-6 mm thick shower door. Roller diameter: 20 mm, inner hole 6 mm, fixed with M6 screw. The roller is made of copper + POM impeller, and the screw is made of stainless steel. Corrosion and rust resistant steel, good overall performance. Roller's load-bearing capacity, good stability, small friction coefficient, good damping effect. Easy installation, often used for bathroom sliding glass door rollers.