Improving the lives of pets and their people. Stop feeling guilty about leaving your pet at home and give them the freedom to come and go as they please. The Small Ultra Clear Pet Door with four way lock can be used for most cat breeds and some small dogs. The outer frame measures 11.4 in. Dia and clear plastic door measures 7.5 in. x 7.5 in., allowing your pets to use as a window even when fully locked. This pet door is suitable for interior and exterior doors and screens up to 0.6 in. thick to allow your four-legged friend the freedom he or she needs for happiness and health. The four way controlled access allows your pet open access with magnetic closure to ensure the door shuts but doesn't lock. You can also change the access to locked, entrance only and exit only. Perfect for setting up a quiet cat friendly space in busy homes with medium to large sized dogs or young children. You can even give your cat access to closed off litter boxes or separate feeding area. Hakuna Pets is a dedicated pet care company, specializing in independence and safety technology to improve the lives of pets and their people.