Shallow windows and windows with blinds will need Extension Mounts to "push" the shelves out far enough to hang freely in the window.
Extension Mounts are available in two sizes: 2.5" and 5". Both mounts are adjustable so you can extend your shelves out just a little or to the maximum allowed by each mount.
Pencil - Tape Measure - Drill & 1/8" bit for pilot hole - Screw Driver - Step Ladder - Wrench ?/16ths
Mounts should be installed 19" apart - measured from the center of each mount.