General description Designed specifically for cats, the Staywell Cat Door 4 Way with Fixed Tunnel in White offers selective entry with a manual 4-way locking mechanism. This cat flap provides a greater degree of security, helping to keep out strays and other animals. The flap is see-through, tough, and weather-resistant, ensuring durability and functionality. Technical specifications Overall size: 224mm x 224mm (8 7/8" x 8 7/8") Cut out size: 169mm x 169mm (6 5/8" x 6 5/8") Glass cut out: 210mm (8 7/8") diameter circle Max shoulder width: 135mm (5 3/8") Installation depth: up to 54mm (2") Installation Easy to install in most doors, walls, or windows