High quality material The shower pulley is made of high quality iron and nylon, which can be used compatible a long time in a humid environment, is not easy to corrode, has strong support and has a long service life. . . Wear-resistant bass Nylon pulley, flat and smooth, the door can be easily moved by gently pulling the door. There is almost no sound when moving, very quiet and will not make noise in your life. . Pulley Size A total of 8 rollers are included in the package. Its diameter is 25mm, suitable compatible glass doors with a thickness of about 4-6mm, and compatible with glass mounting holes with a diameter of 12-14mm. . Easy to use This compatiblement shower door roller is very easy to install. We include screws and nuts. All you have to do is line up the rollers with the glass mounting holes and use a screwdriver to tighten the screws.