High Quality: It is made of high quality zinc alloy and is extremely durable. All curtain rollers can roll and slide smoothly on the track. Lightweight but strong gliders, easy to glide. Perfect Size: This metal rail roll measures: Overall Width: 18mm; Total length : 14mm; Not : 9mm. Versatile, perfect for curtains, sheers, sheers, jars, shower curtains. About the Design: The hook is designed to hang on a 360 degree rotating hanging rail, which is modern and classic. The silent wheels are covered with rubber, which glides smoothly and quietly, creating a quiet and elegant living environment for you. Easy and Convenient: For pleated curtains with hooks, simply insert the hooks into grommet at the bottom of the holder. For curtains with eyelets or loops at the back, simply add the hooks. Scope of application: Ideal for hanging curtain panels, room dividers, curtains, draperies and valances. Widely used in windows, cabinets, bedrooms, offices, restaurants, sliding doors, etc. Product Specifications Material: Stainless steel Product color: as shown. Size: Total width: 18mm; Total length : 14mm; Not : 9mm. Quantity: Package Includes 20pcs Metal Bottom Rollers Precautions: 1. Due to the difference in light and screen, the color may be slightly different from the picture. 2. Due to manual measurement, there will be 0.5-2cm difference, please forgive me.