DIMENSION: The white curtain hook has a length of 18 mm, bottom diameter of 9 mm, cylinder diameter of 6 mm, and a spacing of 3 mm between the top and bottom. Package includes 50 pieces of white curtain slider hooks. COMPATIBILITY: These curtain track rollers are designed for 9 mm wide curtain track rails. Suitable for windows, bedrooms, dining rooms, sliding doors, fixed curtain panels, room dividers, shower enclosures, curtains, sheer fabrics, and hanging textiles. MATERIAL: Made of high-quality plastic. These curtain rail gliders will not rust or stain your curtains, unlike metal alternatives. EASY TO USE: Simple to install—insert the hooks into the curtain track at one end and hang the curtain at the other end for smooth sliding operation. SMOOTH OPERATION: Each hook is designed for seamless movement along the track. Provides quiet, effortless gliding for easy curtain opening and closing. PACKAGE INCLUDES: 50 plastic carrier glide rollers for 9 mm curtain tracks, suitable for window, door, and shower curtains. NOTE: Small parts—keep away from children.