Versatile Compatibility: Designed for seamless installation of Microchip and Manual-Locking Cat Flaps into windows, walls, and metal doors, making it a seamless fit for various home setups Flexible Fit: Accommodates glass openings ranging from 212 mm to 285 mm in diameter, ensuring a snug and secure fit for your cat flap installation Energy Efficient Design: Comes with a gasket to enhance energy efficiency, helping to maintain your home's temperature and reduce energy costs Comprehensive Kit: Includes all necessary screws, screw plugs, and two installation templates, providing everything you need for a hassle-free setup A 27 Year Legacy of Joy: Since 1998, PetSafe has been dedicated to creating innovative products that ensure safe and healthy pets, bringing happiness to pet families worldwide and enriching the lives of pets and their owners