Galvanized door rollers: 25mm (diameter) wheels, galvanized, anti-rust For glass doors with a thickness of 4-6mm and a glass opening of 12-14mm No noise when opening the shower door, these glass door rollers help it slide smoothly Easy to install and maintain, these replacement shower door rollers fit most shower, shower and steam room enclosures and fit on the top andm of the shower door for easy opening and closing Smooth sliding and no noise: The shower room casters are made of copper and galvanized plastic alloy materials, which are strong support, rust-proof, and can be used in wet environments for a long time The sliding door is easy to move, and the moving noiseless shower door double roller slideway is easy to install, please determine the size of the roller and the diameter of the glass hole you want Package size 11 x 9 x 5 cm Material: Glass Item weight: 170g Includes: 4 pulleys+4x bumper+4x screws