CEESC 4WAY Pet Door for Small Dogs and Cats, Pet Entrance Door, Doorway, Draft Prevention, Japanese Instruction Manual Included (White, Large) Size: L (Large): 25 x 23.5 x 5.5cm Weight: L (Large): 496g This pet door allows cats and small dogs to come and go freely. It has 4 settings: one-way (either entrance or exit only), free passage, and restricted passage. This type can be installed by making a hole in a wall or door. It fits doors approximately 3cm thick, but for thicker doors, you can use longer screws to set it up. The inner bag is unopened. The size is L (Large).