The Silver 4 Way Manual Locking Cat Flap by Staywell is designed to allow only your cat access in and out the house. Designed with a see-through rigid flap and a universal fitting allowing the cat flap to be installed in windows walls and doors. The 4 way manual locking cat flap gives you control. Opened - allowing the cat to either enter and exit the house as it pleases Locked - lock the cat flap permantly so the cat is restricted to either the house or outdoors. In Only - indoors only option which locks the cat within the home but restricts it from going back out. Out Only - allows the cat out but restricts it from coming back in. It has a 3 year guarantee and is Suitable for cats up to 7kg (151lbs) and maximum shoulder width of 150mm (5 7/ 8 ").Overall size 241mm x 252mm (91/4" x 93/4") Cut out size 168mm x 175mm (61/2" x 63/4"). Glass cut out 212mm (83/8").