Package Contents You will receive 4 bathtub rollers, roller diameter: 23mm; comes with screws, screw size: M4*12mm, enough quantity can meet your needs. High Quality MaterialsMade of nylon caster and copper chuck, provides good overall performance. If you have any problems sliding the shower door, you can use this to repair it to ensure the most comfortable sliding of your door. Shower Door Wheel Roller High durability and long service life. The design is reasonable, making the shower roller effortless to use, and reasonably implementing the glass quality assigned to them, to control the movement in a given direction. Easy to Use Easy to install. It has good stability, low friction coefficient and good mute effect. It is often used in the sliding tracks of bathroom sliding glass doors. ApplicationsThe shower door sliding track is suitable for most shower rooms, shower cabins, bathtubs and steam rooms, etc. The sliding track allows you to slide the bathroom door easily and smoothly when you use it. Suitable for most shower stalls, shower cabins and steam rooms. Specifications: Material: Nylon Caster + Copper Mandrel Roller Outer Diameter: 23mm Screw Size: M4*12mm Package Includes: 4 x Shower Door Rollers 4 x M4 Screws Note: Please measure the dimensions for better installation before purchase. We only provide one size screw, if you need different size screw, you need to buy it yourself.