high quality Wide Applications: the rail gliders is an ideal addition to your home curtains, and is also suitable for closet doors, shower curtains, room dividers, window, trailers, kitchens, bedrooms, etc., making your life more convenient and protecting your privacy Enough Quantity: you will receive 150 curtain track rollers, with a transparent plastic box for easy storage, no need to worry about losing or placing them in pieces; Note: please check whether the size matches the required item before purchasing Suitable Size: the wheel diameter of these curtain track hooks is about 0.45 inch, the wheelbase is about 0.35 inch, the center axis width is about 0.2 inch, and the overall width is about 0.55 inch, which is suitable for most curtain tracks Easy to Install: just need to connect curtain track gliders to the ceiling track system, suitable for curtain track carrier; The metal ring design is convenient to match different types of curtain hooks, and the dual wheel design makes the track rollers slide smoothly Reliable Material: these ceiling curtain track gliders are made of a combination of sturdy plastic and stainless steel, which is not easy to break and can keep for a long time, lightweight and practical, suitable for your sliding curtains and dividers travel