Curtain track rollers: You will receive 20 curtain track rollers of the same size. The wheel diameter is 14.5 mm and the outer diameter is 17.5 mm, which is suitable for curtain tracks with a track width of 18-23 mm. Installation is easy: simply 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 won't jam. Application: It can be installed in the windows of your living room, study, bedroom, home office, piano room, or dining room, and you can easily pull curtains, making every morning beautiful. Noise-free design: Thanks to the silent double-layer design of the roller track, the pulley produces minimal noise when pulling the curtains. When you get up in the morning and open the curtains, you won't hear the harsh noise. Sturdy material: Made of high-quality plastic + stainless steel, durable and not easy to rust. With a super load-bearing capacity, all curtains can roll and