Please note: This product might take a little longer to arrive as it may be shipped from outside the UK. The Staywell Dog Flap 640 is an easy and practical solution for you and your dog. The Staywell Dog Flap is simply installed in the door or wall. With the 2-way-closure-system allows you to decide whether your pet can get in and out at any time or whether the door remains locked. The stable and flexible flap has a slightly milky colour and is particularly quiet. The aluminium frame gives the dog flap an elegant look and high stability at the same time. The 2-way-closure-system can be used for: entry and exit locked door Dimensions: Overall dimensions: 502.6 x 329.1 mm Cut-out size: 451 x 277 mm Flap opening: 260 x 413 mm Size of the cut-out: 277 x 451 mm Frame thickness: Fits doors and walls with a thickness of up to 51 mm (at least 8 mm if excess aluminium tunnel has been removed) Frame depth: - Inside, with installed closing plate: 21mm - Inside, without installed cover plate: 8.5m