These Sash Pet Doors provides your pet with easy access in or out of your home without having to install the pet door within a door or wall.;High quality aluminum construction in a white finish. Installs easily into most styles of sash windows (windows that slide up and down).;5/8 thick on all sides and will fit in most standard window tracks. Fits windows 33 to 38 Wide.;Spring loaded locking slide. Unbreakable Lexan clear vinyl flap with magnetic closure included.;Flap Size: 10-1/2x15. For Pets 36 to 90 lbs lbs.