The In-Tension Rod is an innovative decorative inside mount rod that does it all. It won't slip or slide with the choice of mounting options. It can be easily spring tension mounted, which requires no hardware, or for more stability it can be hung with the included invisible screws, one on each side hidden by the decorative end cover. Use the "Joiner" (sold separately) to combine multiple In-Tension rods to accommodate any width window. Diameter of rod measures 3/4". Coordinate with matching hook/clip rings (sold separately) to complete the look. One-year warranty.