These hooks are GREAT and make hanging a shower curtain with a liner behind it easy as pie!  No more trying to "thread" the curtain and liner on one hook...the two hooks are ingenious.  And since you can remove one curtain separately, it makes taking down the fabric curtain for washing really easy...or replacing the plastic liner whenever it needs replacing.  Also, the hooks slide very easily when opening and shutting the curtains.  Highly recommend!