Thanks to its adjustable tunnel, this cat flap fits wooden doors from 11 to 52 mm thick.The 170 x 155 mm flap is suitable for all breeds and sizes of cat.ADAPTABILITY:The different Catwalk models can be adapted to all types of door (thicker or thinner, wooden or glass) and to different sizes of animal.TRANQUILITY:The 4-position locking system – entry only, exit only, free entry and exit, complete locking – allows the pet to move freely and gives the owner peace of mindesprit.RELIABILITY:Made from high-quality materials.