1. Each set of packages contains 3 spring pull rods, including an extension rod with a diameter of 0.87 inches and an inner spring rod with a diameter of 0.75 inches. The pull rod is made of 4mm thick stainless steel and is equipped with a 1.3-inch non-slip rubber pad at the end. 2. The two-section combination can be used in a range of 27.2-37.4 inches, and the three-section combination can be used in a range of 39.8-50.1 inches. Note: 37.5-39.7 inches is not applicable. Load-bearing range 11 pounds. 3. Easy to install and easy to adjust, no tools required, no rust, and can be easily applied to glass, wooden walls, marble, lime walls and tiles. These tension curtain rods are suitable for windows of 28-48 inches, 24-36 inches. 4. [Wide Application] Curtain rods do not require drilling - suitable for a variety of spaces, including windows, bathrooms, RVs, closets, kitchens, doorways, bookshelves and room dividers.