Give your cat or small dog easy room-to-room access with the PetSafe Interior 2-Way Locking Cat Door. Built for pets up to 15 lb (6.8 kg), it features a durable high-impact plastic frame and an easy-to-use slide lock. Choose between two settings—opened or locked—to control indoor movement. The white frame fits interior doors 3/16 to 2 inches thick and provides a 5-3/4 in x 5-3/4 in flap opening; outer frame measures 7-1/2 in W x 7-7/8 in H. A reliable interior cat door and small dog door solution for indoor use.