The PetSafe® 4-Way Locking Interior Cat Door gives you control of your cat's indoor access. The 4-way lock allows your cat to have access to their food and litter box or move freely between rooms throughout the house. This cat door is easy to install and fits doors 1 1/8 inches - 2 inches thick. This door is best for cats who weigh up to 15 pounds. Trust PetSafe® to help keep your pet healthy, safe and happy.