High quality: High quality POM plastic. Fits different types of showers. Ensures your doors glide more comfortably. No decompression and no waste of money: Have you bought a sliding system and it is broken? You think with horror that now you have to buy a new one. Forget it! There are replacement shower door rollers that will fit any sliding system in your home. If you are having trouble sliding shower doors, use this quick solution and don't waste your money. Use everywhere: Shower door slides for showers, massage rooms, bathtubs, jacuzzis and even for furniture accessories. Ensure the door or doors open easily and smoothly. Replace your broken system. Premium quality shower rollers. Rolling component: Smooth rolling of the door with a slight effortless forward or backward movement for shower enclosures, hydromassage boxes clearly performs the task assigned to them, distributes the mass of the glass, controls the movement in the given direction. This gives the product even more durability and a longer service life. Steel part of the wheel: 9 mm diameter x 3 mm height. Type: 4 shower door rollers. Wheel thickness: 5 mm. Comes with screws. Suitable for a shower door with a thickness of 4-6 mm. Roller diameter: 20 mm, inner hole 6 mm, fixed with M6 screw. The pulley is made of copper + POM wheel, and the screw is made of stainless steel. Corrosion and rust resistant steel, good comprehensive performance. Pulley bearing capacity, good stability, small friction coefficient, good mute effect. Easy installation, often used for bathroom sliding glass door pulley.