Nice tension rod which fits inside my window casing to lovely wood molding. There were no written instructions only some small pictures which I couldn't really see. Finally figured out that the screw needs to be loosened and then moved a little further out than the width of the interior window so that when you pull it in against the spring it will hold the curtain.  The prior tension rods I had concealed the spring so that added to my confusion with adjusting these, however, they work very well.