【Shower Door Rollers Size】4 pcs Shower Door Rollers Runners Wheels, Diameter of the wheel: 19mm; wheel thickness: 5.5mm. comes with screws. (Note: Please measure the size you need before buying to choose the right size.)【Preferred Material】Nylon & Copper, Good Elasticity, Good wear resistan, corrosion resistance, rust prevention, of stable quality and has a long service life.The Shower Door Rollers has strong bearing capacity and good stability, the friction coefficient is small and the mute effect is good.【Installation Convenience】You can simply disassemble it by screwdriver and replace with new rollers on glass doors. No Noise to open the shower door and these glass door roller help it slide smoothly. It is easy to Install and Maintenance. According to the requirements of the use of bathroom glass sliding door pulley/slide reasonable collocation, giving more flexible collocation.【Use Effect】Pulley bearing capacity, wear resistance, rolling friction coefficient is small, smooth sliding, silent effect is outstanding, can be a good replacement for your old or broken roller, No Noise to open the shower door and these glass door roller help it slide smoothly.【Wide Application】Often used for bathroom glass sliding door pulleys/rails.Shower Door Rollers Runners Wheels, for shower doors and massage cabins, bathtubs, Jacuzzi or any other furniture fittings. Suitable for most Shower Enclosures, Shower Cabins and Steam Cabin Enclosures.