"The Cat Mate 307w comes in a white finish and gives you control over your and other cats access to and from your home. The cat flap locks 4 different ways which are as follows:- Unlocked, - Locked, - In Only, - Out Only. Suitable for single and double-glazing and panels up to 2in thick. The flap is draughtproof and weatherproof due to the brush-sealed flap. Silent action transparent door which will not disturb you or other pets.Approx. sizes:Overall Width: 24.8cm. Overall height: 26.5cm. Cut Out Width: 16.6cm. Cut Out Height: 19.2cm."