Measure Before Purchasing: Measure your pet and the window frame before purchasing. This cat door for window includes a 5-inch adjustable length to ensure a comfortable fit for your cat and proper compatibility with windows 4-Way Locking System: Switch between in-only, out-only, two-way access, or full lock mode. This aluminum window cat door gives your cat flexible movement while helping maintain a calm home environment Smooth Auto-Close & Tight Seal: The magnetic flap pairs with a brush-lined edge for smooth, quiet self-closing and a secure seal. Our window pet door helps keep your indoor space warm and clean as your cat moves through Tool-Free Installation: No drilling needed. Simply place the pet door for window into the window track, tighten the knobs, and enjoy a quick, tidy setup Premium Aluminum Alloy Frame: Crafted with a sturdy aluminum alloy frame and a clear, scratch-resistant flap, this window pet door for cat holds up to daily use and your cat's curious adventures