Suitable for use with poles up to 35mm diameter Made from rustproof metal, provides a smooth running surface to slide the curtain easily Easy to install, simply make curtain rings go through rods one by one, and hang the curtain hooks into the small rings of these curtain rings, then you can slide the curtain easily Applied for most kinds of curtains, such as shower curtain, window curtain, french window curtain and so on 50 heavy duty curtain rings included, enough for daily life and replacement