Selective entry / Manual 4 Way Locking Cat Flap - WHITE - No. 917 Designed specifically for cats. Greater degree of security. Helps to keep out strays and other animals. See through, tough and weather resistant flap. Easy to install in most doors, walls or windows. Installation depth: up to 54mm (2"). 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"). Extendable tunnel NOT available for this model. Staywell Cat Door 4 Waywith Fixed Tunnel White -