Product description Outer size: 7.56" / 19CM(W) x 8.46" / 21.5CM(H) x 2.17" / 5.5CM(D) Inner size: 6.18" / 15.7CM(W) x 6.30" / 16CM(H) x 2.17" / 5.5CM(D) It's suitable for cat lighter than 15.43 lb and waist circumference shorter than 15.75" / 40CM. Note: 1). Make sure that the width and height(shoulder level) of the pet are inferior to the pet screen door, thanks. 2). The magnet at the bottom of the door frame is for aligning the flap after swings, it doesn't work as a lock, thanks. Upgraded Product Features: 1. Convenient knob-style switch, you could easily control your cat or other cats in or out options, in only, out only, in and out freely, totally locked. 2. Fixed groove with snap tabs for weather-proof brush strip greatly help fix it. 3. Tunnel depth could be cut down, plus 1 package long + 1 package short screws, double-sided tape, considerably meet your needs that install to different kinds of interior doors, exterior doors, walls, windows, cupboards, glass, etc.