Thank you for viewing! This item is a pet door specifically designed for screen doors, allowing pets to come and go freely. Because they can come and go as they please, it expands their range of activity and helps them get exercise. A magnet is built into the bottom of the door, so it closes tightly, and the screen door's original function is not compromised. If you don't want your pet to go out, just use the lock! The door is fixed with screws, so it's very stable. Made of high-quality ABS material and reinforced with screws, the screen door is highly durable. Size: 24*29cm There may be slight variations in the actual dimensions of the product depending on the item. Type of item...Pet door Type of item...Training supplies