High Quality: High Quality POM Plastic. Adapts to different types of showers. Guarantees a more comfortable glide for your doors 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 There are replacement shower door rollers that will fit to any sliding system in your home. If you're having trouble sliding the shower doors out, use this quick fix and don't waste your money Use everywhere: shower door slides for showers, massage cabins, bathtubs, jacuzzi and even for furniture accessories. Make sure 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 perform the task assigned to them, distribute the mass of the glass, controls movement in the given direction. This gives the product even more durability and a longer lifespan Steel part of the wheel: 9 mm in diameter x 3 mm in height Type: 4 rollers for shower door. Wheel thickness: 5 mm. Supplied with screws. Suitable for a 4-6mm thick shower door. Roll diameter: 20mm, inner hole 6mm, 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 all ro performance. Pulley bearing capacity, good stability, small coefficient of friction, good mute effect. Easy installation, often used for sliding glass door pulley bathroom.