Cat Flap Door with 4 Way Lock Pet Door Telescoping frame 1.25 to 1.75. Cat Flap Door for cats up to 12 pounds. Ideal for interior & exterior doors. Unbreakable Lexan flap and magnets. 4-way lock lets you give your cat the access he needs. Flap measures 6 1/4 x 6 1/4" Need Assistance? E-mail Ideal Pet Products expert US-based customer care specialists seven days a week!