The 255w glass fitting electromagnetic cat flap white (also available in brown) is designed to allow only your cat access in and out the house keeping strays out. It comes with two super compact cat collar magnets. The 255 glass fitting electromagnetic cat flap has a transparent flap which fits glass wooden and plastic panels. The cat flap has been specially designed with a silent action which wont frighten pets or disturb its owner. There is a fantastic four way locking system which allows the cat to either enter and exit the house as it pleases lock the cat flap permantly so the cat is restricted to either the house or outdoors. Indoors only option which locks the cat within the home but restricts it from going back out. The opposite option to this allows the cat out but restricts it from coming back in. The 255 glass fitting electromagnetic cat flap has an incredible lifetime parts service and comes with a 3 year guarantee. Dimensions: self lining to 2"1/ 8" (55m) thick overal size of the product 10"3 / 8" x 10"7/ 8" (264mm x 277mm) cut out size 9"3/4" diameter (248mm diameter)