Curtain rod with clips come with just the ring clips for using with proper diameter poles or curtain rods. These will hold light weight curtains, not super heavy curtains.
Bypass ring with clip 
Flat ring with clip 
Clip on ring and clip 
Ring with clip 
Ring with clip 
baton with C-ring clip 
Curtain rod ring clip 
Curtain rod clip on ring 
Ring with clip 
Wrought Iron 1″ diameter pole ring with clip