The pet door is made of sturdy plastic and ABS material so it won’t warp even in extreme temperatures. Dimensions: This is a large pet door , external dimensions: 26x26cm, suitable for installation on thin metal doors, doors and walls, the cat flap is suitable for walls with a thickness of 6cm, if the wall exceeds this thickness, there will be gaps pet door is suitable for cats under 17 lbs (~7.7 kg) and under 23 inches (~58.4 cm) tall. Four-way lock: The cat flap with lock has 4 modes of commutation. The cat flap can be adjusted by a red and green switch with a label. It can be set to open, only out, or fully locked, and is easily adjustable so your pet can get in and out. The clear flap that most pets love, the pet guard breeze and wiper seals are sealed flaps with fasteners. The brush bar reduces energy loss and silent action, ensuring that pets and owners are not disturbed.