EASY TO INSTALL AND REMOVE: The shower curtain hook opens and closes easily without tools and slides smoothly through shower curtain holes and rods. HIGH QUALITY: The curtain rings are made of metal, sturdy and durable, and come in 40 pieces for replacement. HOOK INSTALLATION: The curtain hooks come with quick-release fasteners that lock securely into place after installation, keeping your items hidden. VERSATILE: The shower curtain rings fit standard rods and are compatible with most shower curtains or curtain liners; they can also be used to hang other small items. RING HOOK SIZE: The total hook size is approximately 6.8 x 3.5 cm, and the thickness is 2.2 mm. A total of 40 curtain rings are included.