Set of 4pcs rollers for 23mm shower cabins High quality: the pulley is made of copper + POM wheels, and the screw is made of stainless steel, it is corrosion and rust resistant and has good overall performance. Bearing components: load capacity pulley, good stability; low coefficient of friction, good cushioning. Can be used everywhere: walkway for shower doors, massage cabins, bathtubs, jacuzzis, and even for furniture fittings. Product description: Material: copper + POM wheel Roll outer diameter: 23 mm Inner hole: 5mm Wheel thickness: 5.5mm, supplied with M6 screws, suitable for 4-6mm thickness shower door. - Pulley ability, good stability; low coefficient of friction, good cushioning effect. - Easy installation, often used for pulleys/slide rails for bathroom sliding glass doors. Kit includes: 4 shower door casters 4 stainless steel screws stainless steel M6.