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Generous flap size 170mm x 150mm(6 3/4 x 6").Fits wooden or UPVC doors from 15mm(5/8")to 60mm(2 3/8")thick.Suits cats and small dogs.The door flap is manufactured from Bayer tough high impact Polycarbonate.The material is also used for bullet proof windscreens,vests and aircraft windows.A four way manual locking system is provided to allow the owner flexibility with the pet's movements.In only position,will allow your cat entry but prevent the cat from leaving.Out only position,will allow your pet to leave the house but prevent the cat from re-entry,it will also keep stray cats from entering.The locked position will prevent the pet from both entry and exit.The in and out position will allow both entry and exit.Our wooden door model W-CD is designed to fit into external wooden doors or wall panels from 15mm(5/8²)to 53mm(2 1/4²).This model may be easily fitted by the home handy man.Overall size:71/2" x 99/16"(188mm x 245mm).CutOut Size:173mm x 228mm(9" x 6 13/16").Thickness:Self lining to 13/4"(45mm).