Keep your best fur-iend safe and secure with the Ideal Pet Products Sash Window Dog Door! This contemporary flap door is specially designed for aluminum sash windows. It’s made from high-quality aluminum materials， and it features a neutral white finish to match most home décor. It features a 20- and 3/8-inch flap， and it’s available in two different sizes that adjust between 27–32 inches or 33–38 inches. It’s also easy to install， which is a perk for pet paw-rents. If you’re looking for style and functionality， then this is the paw-fect door for you and your furry family members!