【Package Contents】 You will receive 4 bathtub rollers, roller diameter: 23 mm; comes with screws, screw size: M4 * 12mm, a sufficient quantity to meet your needs. 【High-Quality Materials】 Made from a nylon roller and a copper chuck, it offers good overall performance. If you experience problems with your shower door sliding, you can use this to fix it and ensure the smoothest possible sliding action. 【Shower Door Roller】 High durability and long service life. The design is reasonable, making the shower roller effortless to use, and is well-suited to the glass material, ensuring controlled movement in a specific direction. 【Easy to Use】 Easy to install. It has good stability, a low coefficient of friction, and a good noise-reducing effect. It is often used in the sliding tracks of bathroom glass sliding doors. 【Applications】 The sliding shower door rail is suitable for most shower rooms, shower cubicles, bathtubs, steam rooms, etc. The sliding rail allows you to easily and smoothly slide the bathroom door open and closed during use.Suitable for most shower cubicles, shower cabins and steam cabins.Materials: Nylon roller + copper chuck Roll Outer Diameter: 23 mmScrew Size: M4*12mmThe package includes:4 x Shower Door Rollers4 x M4 ScrewsNote:Please measure the dimensions for better installation before purchasing.We only supply one size screw; if you need a different size screw, you must purchase it yourself.