Product description: Materials: ABS plastic Colorwhite Size: S: Outer door frame size: 25*23.5*5.3cm Inner door frame size: 19*18cm Package Includes: 1 x Tunnel Pet Door 8 x screws 1 x Condition Manual (Probably not in German) Description: 4-way access control: open inward, open outward, both directions open, locked. Use the cat flap to allow cats to come and go as they please, or to keep them safe in or out of the house when needed. Don't play the cat's door opener in the future. Easy Installation: This pet door is suitable for brick wall, wooden door, PVC door, and metal door, and can be installed in doors and walls with a thickness of 2-6cm. The cat door is made of durable ABS plastic, weather-resistant and easy to clean. Quiet---Self-closing---Windproof: 1:) This free swing door is extremely quiet for the brush bar seal. 2 :) Magnetic closure ensures that the cat flap is returned to its original position after actuation. 3:) Windproof and protects against drafts. So that you don't freeze in winter or in stormy autumn. Swinging Flap Design: The clear flap is made of high-strength fiberglass, which protects against UV rays, has good transparency, and protects against pet grasping and biting. With this cat flap, you enable your four-legged friend to explore the garden independently.