Fast Fit No Tools 28 In. Adjustable Spring Tension Curtain Rod, 7/16 In. The Kenney Fast Fit No Tools 7/16″ Spring Tension Rod is a versatile and easy to use solution for hanging your curtains. It is quick and easy to install inside of your window casing with no tools required, making it the perfect solution for areas where installing traditional curtain rods is not an option.