This aluminum cat door fits window tracks between 31 and 36 inches wide, using a 5-inch adjustable length so you can dial in a tight, gap-free fit without drilling into the frame. Switch the 4-way lock between in-only, out-only, two-way access, or full lock to control your cat's movement and keep the house secure when needed. A magnetic flap with a brush-lined edge closes quietly and consistently, helping the 7.6 x 10.3 inch flap opening stay sealed against drafts as your cat passes through. Installation is tool-free: slide the frame into the window track and tighten the knobs for a secure hold. At 8.4 pounds, the aluminum alloy and glass construction resists scratches and daily wear, and measuring your window opening beforehand ensures the adjustable range matches your track.