Ideal Pet Products Aluminum Sash Window Pet Door, Adjustable Width 23" to 28", Cat Flap, 6.25" x 6.25" Flap Size, White High quality white finish aluminum construction Installs easily into most styles of sash windows Flap size 6-1/4-inch x 6-1/4-inch. Magnetic flap closure ensures a strong seal when door is not in use 3 Window sizes available: adjustable width from: 23-inch to 27-inch (23), 27-inch to 32-inch (27) and 33-inch to 38-inch (33) Need Assistance? E-mail Ideal Pet Products customer care specialists seven days a week!