Package Included 50 pieces of hooks, length 45mm, ring inner diameter 18mm, can withstand heavy curtains.Curtain hooks with one-piece opening, easy to detach from the rings, easy to install without removing the curtain rod (make sure the diameter of the curtain rod is less than 18mm). Easy to Hang: Just insert the straight end of the hook wire through the curtain hole and hang the hook on the curtain rod, it can be easily assembled and disassembled. SMOOTH SURFACE - Polished curtain hooks without burrs, easy and safe to use. Don't worry about hurting your fingers or scratching your curtains. Tool-free installation: allow you to quickly attach the curtains to the shower or window without tools. Wide range of applications: These metal curtain hooks can be used for various curtains such as shower curtains, normal window curtains, fabric curtains of various types, which can hold and fix the curtain firmly.