These curtain rail hooks have a smooth surface and flexible rollers,allowing them to glide smoothly and quietly on the curtain track,making it easier for you to open and close the curtains. The curtain track hooks are made of high-quality plastic,which is lightweight,sturdy,low-noise and has a long service life. Unlike metal hooks,they will not stain your curtains due to rust. Easy to install: Simply slide the plastic curtain hooks gently onto the curtain rail and you can assemble without additional tools. The white hook matches various styles of curtains,simple and beautiful. Curtain track gliders can be installed on curtain rails/inner rails with an inner diameter of 3.4-6mm,suitable for curtains,door curtains,shower curtains,etc. Note: Please confirm the size before purchasing. Packaging: 100 PCS curtain track glider hooks and 6 PCS locks..