These pet doors are designed specifically for security screen doors. Easy to fit with simple instructions. Can be fitted on site without removing the door Handyman tools required Made from UV stabilised plastic Magnetic closure Spare parts available if required Australian designed, owned and made.�SizeSmall – opening size 24cm (H) x 19cm (W), suitable�for all size cats�and small dogs especially Yorkshires Terries, Pekinese, Dachshund and Miniature Poodles.Medium – opening size 31cm (H) x 23cm (W), suitable for all medium dogs especially for Spaniels, Terriers and Poodles.Large – opening size 40cm (H) x 26cm (W), suitable for all large dogs especially for Labradors and German Shepherd.We suggest the best way to see which size Petway Pet Door is suitable for your pet is to cut the dimensions of the flap opening out of a piece of cardboard and see which size your pet is most comfortable going through. Please remember Petway Pet Doors are used for convenience whilst you are at home.ColourAvailable in black, white, stone beige, primrose yellow, brown and bronze.The Petway pet door may increase the risk of theft or damage by an intruder or unwanted animal. The product is not to be fitted to any doors leading to a swimming pool. Petway Access Doors and Vet Net Supplies will not be liable for any loss or damage caused by fitting and using their product.