Quick installation for sliding windows Adjustable height up to 3 inches Corrosion-resistant aluminum framing Durable plastic PetSafe pet door Door cover included for controlled pet access Custom sizes available with 3 - 4 weeks processing time The PetSafe Horizontal Window Pet Door is an easy and affordable solution for pet owners seeking a convenient pet door for their cats and small dogs. With a hassle-free installation process that requires no drilling or cutting, this pet door fits seamlessly into most horizontal sliding windows. Featuring a flexible vinyl flap for easy use and a corrosion-resistant aluminum frame for durability, this pet door also has a single-pane, tempered glass design that ensures safety. The spring-loaded design allows for instant height adjustment of up to 3 inches, creating a snug, weather-tight fit. The built-in Anti-Whoops feature compensates for small measuring errors, offering a 3/4" change in adjustment range. A closing cover is included to control your pet's access, snapping securely over the pet door. The PetSafe Horizontal Window Pet Door is an ideal choice for pet owners seeking a low-impact installation method that provides convenience and freedom for both pets and their families.