Drops into a sliding window: Fits the open half of a horizontal sliding window, no cutting or drilling Sized for cats only: Smaller, lighter, and less expensive than the dog-sized window panels, with a cat-flap opening Two colors: White or black aluminum framing to match your window Track heights 33.5" to 60.5": Adjustable in 1.5" bands across the stock range, plus a custom-height option Made in USA, locking cover included: Built domestically and backed by a 3-year warranty The Liberty Cat Door for Horizontal Sliding Windows is a removable insert sized specifically for cats. It uses the same install approach as our dog window panels, but with a smaller flap opening and a more compact frame.Aluminum frame, in white or black. Stock track heights from 33.5" to 60.5" in 1.5" bands, with a custom-height option. The flap is clear vinyl. A locking cover ships in the box for nights and trips away. Cat doors are not sized for dogs, even small ones, so the dog will not fit through this panel.Before ordering, measure the inside height of the window opening with the window all the way open. Pick a height range that brackets your measurement. If you need a larger flap for a dog instead of a cat, use the white or black dog-sized window panel. Pair with the Cat Flap Locking Cover for additional security.Made in the USA and backed by a 3-year warranty. Easy DIY install.