Curtain track pulley: You will receive 20 curtain track pulleys of the same size. The wheel diameter is 14.5mm and the outer diameter is 17.5mm, which is suitable for curtain tracks with a track width of 18-23mm. Installation is simple: just insert the pin hook into the eyelet at the bottom of the bracket. For curtains with holes or loops on the back, simply add hooks. The track wheels are smooth and not stuck. Scope of application: It can be installed in the windows of your living room, study, bedroom, office, piano room, dining room, and you can easily pull the curtains to make every morning beautiful. Noise-free design: The silent double-layer design of the rolling rail, the pulley will produce the least noise when pulling the curtains. When you get up in the morning and open the curtains, you can't hear the harsh sound. Stable material: made of high quality plastic + stainless steel, durable and not easy to rust, with super capacity load, all curtains can roll and slide smoothly on the rail. Note: The data are all measured manually, please allow 1-3cm error due to difference in light and temperature. display, there may be some color differences, please refer to the actual item received.