Cat Door for Window 71191763Features & Details 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