High Quality: High quality POM plastic. Adapts to different types of showers. Ensures your doors glide more comfortably No decompression and no wasted money: Did you buy a sliding system and it's broken? You think with horror that now you have to buy a new one. Forget ! There are replacement shower door rollers that will fit any sliding system in your home. If you're having trouble sliding shower doors, use this quick fix and don't waste your money Use anywhere: shower door slides for showers, massage cubicles, bathtubs, hot tubs and even for furniture accessories. Make sure the door or doors open easily and smoothly. Replace your broken system. Premium 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, distributes the mass of the glass, controls the movement in the given direction. This gives the product even more durability and longer life Steel part of the wheel: 9mm diameter x 3mm height Type: 4 rollers for shower door. Wheel thickness: 5mm. Supplied with screws. Suitable for 4-6mm thick shower door. Roller 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. Heat resistant steel corrosion and rust proof, good comprehensive performance. Pulley bearing capacity, good stability, small coefficient of friction, good mute effect. Easy installation, often used for bathroom glass sliding door pulley. Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and weather. display, there will be a certain color difference, the actual object received shall prevail.