【Perfect Experience】Material of sliding door rollers: High quality nylon wheel + copper shaft, low noise, elegant performance and smooth rolling, suitable for glass thickness 4-6mm. 【Shower door rollers】Set of 4 shower door rollers. Bathroom DIY replacement parts 23mm diameter (2 top rollers and 2 bottom rollers), each wheel comes with a bumper and a stainless steel screw. 【Exact Size 】Shower door installation kit Roller diameter 23mm. Wheel thickness: 5 mm, thickness of the shower door: 4-6 mm, glass mounting hole: 12-14 mm. 【Easy to Use】Easy to slide replacement shower door roller, easy to install and use, with these sliding door pulleys, the shower door will slide like butter . 【Great Function】Shower door rollers suitable for most shower cabins, shower stalls and steam cabins. Note: The data are all measured manually, Please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.