This aluminum cat door mounts right into your window track, giving your cat a dedicated way in and out without you tending the window all day. It adjusts across a 5-inch range to fit window widths from 23 to 28 inches, and the frame holds a 7.6 x 10.3 inch flap sized for cats to pass through comfortably. A 4-way lock lets you set in-only, out-only, two-way, or full-lock access, so you can keep your cat inside overnight or block entry from strays without removing the door. The magnetic flap closes quietly against a brush-lined edge for a tight seal, helping keep drafts and outdoor air out of the room. Installation is tool-free: slide the frame into the window track and tighten the knobs, no drilling required. Before ordering, measure your window track width and check it falls within the 23 to 28 inch range, since the frame itself is 1.6 inches thick. The aluminum alloy frame and glass panel hold up to daily use, and the whole unit weighs 6.8 pounds.