Package ContentsYou will receive 4 tub rollers, roller diameter: 23mm; comes with screws, screw size: M4*12mm, enough quantity can meet your needs. High Quality MaterialsMade of nylon roller and mandrel made of copper, offers good overall performance. If you have any problems with the sliding of the shower door, you can use it 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, make the shower roller effortless to use, and reasonably implement the quality of glass assigned to them, to control the movement in a given direction. Easy to Use Easy to install. It has good stability, low coefficient of friction and good mute effect. It is often used in the sliding tracks of bathroom sliding glass doors. ApplicationsThe sliding shower door track is suitable for most shower rooms, shower enclosures, bathtubs and steam rooms, etc. The sliding track allows you to easily and smoothly slide the bathroom door when using it. Suitable for most shower enclosures, shower stalls and steam rooms. Specifications: Material: Nylon Roller + Copper Core 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 a different size screw, you need to buy yourself.